题目内容
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
C
考查常用词组辨析。at a time 每次,依次;at one time 一度,从前;for some time一段时间;for the time在当时。由句子所使用的完成时态来看,这里要用表一段时间的时间状语。
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