CFCs were banned when world leaders signed _____called the Montreal Protocol in 1987.A.a contactB.contactC.agreementD.an agreement

CFCs were banned when world leaders signed _____called the Montreal Protocol in 1987.

A.a contact
B.contact
C.agreement
D.an agreement

参考解析

解析:本题考查词语意思及冠词用法。题目意为“当世界各国领导人在1987年签署一份名为《蒙特利尔协议》的协定时,氟烃被禁止使用。”A项意为“接触、联系”。B项和A项的名词相同,但是少了个不定冠词a。C项意为“协议、协定”。C项和D项的名词相同,但是少了个不定冠词an. agreement是可数名词,不能不加冠词就以单数形式出现。因此选D项,签署一份协议。
  

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