单选题Experts have been warning _____ of the health risks caused by passive smoking.Aat a timeBat one timeCfor some timeDfor the time

单选题
Experts have been warning _____ of the health risks caused by passive smoking.
A

at a time

B

at one time

C

for some time

D

for the time


参考解析

解析:
句意为“专家们提醒注意吸入二手烟给健康带来的危险已有一段时间了”。at a time=on each occasion“每次,一次”;at one time=at a period of time in the past“一度,曾经”;for the time“暂时,眼下”;for some time=for a fairly long period of time“一段时间”。

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