单选题The rescue team must have searched for the missing visitors two days ago, _____?Amustn’t theyBhaven’t theyCdidn’t theyDhadn’t they
单选题
The rescue team must have searched for the missing visitors two days ago, _____?
A
mustn’t they
B
haven’t they
C
didn’t they
D
hadn’t they
参考解析
解析：
当陈述部分出现must have done时，若强调对过去情况的推测（一般有过去时间状语），反意疑问部分的谓语动词用didn’t+主语；若前句强调动作的完成，疑问部分谓语动词用haven’t/ hasn’t+主语。本句有明显的时间状语two days ago，故选C。
当陈述部分出现must have done时，若强调对过去情况的推测（一般有过去时间状语），反意疑问部分的谓语动词用didn’t+主语；若前句强调动作的完成，疑问部分谓语动词用haven’t/ hasn’t+主语。本句有明显的时间状语two days ago，故选C。
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We all love a hero,and rescue dogs are some of the biggest heroes of all．You will often find?them going above and beyond duty to save someone,risking—and at times losing—their lives in the?process．Rescue dogs are generally found in the Sporting and Hunting Groups,or from the traditional?Herding Group．These types include the Bloodhound,Labrador Retriever,Newfoundland,German?Shepherd,Golden Retriever,and Belgian Malinois—all of which are chosen for search-and-rescue?duty because of their amazing physical strength,loyalty,and their tendency for mental stability．These types also have a keen sense of hearing and smell—to better locate lost individuals—and?are often able to access hard-to-reach areas．As highly trained animals,they serve in many different?fields,including specialist search,snow slide rescue,dead body location,and tracking．To overcome obstacles and succeed when performing the demanding duties of a search-and-rescue?worker,a dog must display certain qualities．In addition to intelligence and strength,the dog must be?swift,confident,easily trainable,adaptable,and have a high level of stamina(耐力)and endurance．A strong sense of group cooperation and an ability to engage in friendly play during“down”time is also required of search-and-rescue dogs．A rescue dog goes through many,many hours of intensive training to be fit for duty．Training is not for the faint-hearted．Certification training can take from two to three years,working three to four hours a day,three to six days a week,often in group,team-oriented sessions．Each search-and-rescue field requires different types of training．Rescue training,for instance,includes“air scenting”—where dogs are trained to smell the air for the victim′s scent(气味)and then follow the scent to the person．This ability is crucial to finding victims trapped under collapsed buildings and snow slide．Rescue dogs are chosen probably because．A.they are loyalB.they are braveC.they have amazing appearancesD.they have good eyesight
We all love a hero,and rescue dogs are some of the biggest heroes of all．You will often find?them going above and beyond duty to save someone,risking—and at times losing—their lives in the?process．Rescue dogs are generally found in the Sporting and Hunting Groups,or from the traditional?Herding Group．These types include the Bloodhound,Labrador Retriever,Newfoundland,German?Shepherd,Golden Retriever,and Belgian Malinois—all of which are chosen for search-and-rescue?duty because of their amazing physical strength,loyalty,and their tendency for mental stability．These types also have a keen sense of hearing and smell—to better locate lost individuals—and?are often able to access hard-to-reach areas．As highly trained animals,they serve in many different?fields,including specialist search,snow slide rescue,dead body location,and tracking．To overcome obstacles and succeed when performing the demanding duties of a search-and-rescue?worker,a dog must display certain qualities．In addition to intelligence and strength,the dog must be?swift,confident,easily trainable,adaptable,and have a high level of stamina(耐力)and endurance．A strong sense of group cooperation and an ability to engage in friendly play during“down”time is also required of search-and-rescue dogs．A rescue dog goes through many,many hours of intensive training to be fit for duty．Training is not for the faint-hearted．Certification training can take from two to three years,working three to four hours a day,three to six days a week,often in group,team-oriented sessions．Each search-and-rescue field requires different types of training．Rescue training,for instance,includes“air scenting”—where dogs are trained to smell the air for the victim′s scent(气味)and then follow the scent to the person．This ability is crucial to finding victims trapped under collapsed buildings and snow slide．What is the passage mainly about?A.Selection process of rescue dogs．B.Qualities and training of rescue dogs．C.Risks rescue dogs are faced with．D.Types of tasks rescue dogs can perform．
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