Expertshavebeenwarning ofthehealthriskscausedbypassi...
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问题详情:
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
【回答】
C
解析:本题考查固定短语。从句中have been warning 可知,应用for some time 一段时间,at a time 每次;at one time 曾经。
知识点:固定句型
题型:选择题
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