Expert have been warning-----of the health risks caused by passive smoking.
A.at a timeB.at one time C.for some timeD.for the time应该选什么,为什么,它们各是什么意思?
人气：288 ℃ 时间：2020-05-28 19:11:16
解答
应该选B,整句意思是,专家曾经警告我们,吸二手烟会导至健康风险.
A.at a time 每次,在某时,B.at one time 同时,曾经 C.for some time 一段时间 D.for the time being 暂时
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