Experts have been warning___of the health risks caused by passive smoking.A．at a - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

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

答案

解析

for some time 意为“一段时间”，因为谓语用了现在完成进行时，所以要用for some time，表示从过去的某个时候开始一直延续到现在的一段时间内，专家一直警告说被动吸烟引起健康危急。at a time意为“每次,在某时”；at one time意为“同时,曾经”；for the time意为“暂时”。

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试题【Experts have been warning___of the health risks caused by passive smoking.A．at a】；主要考察你对介词和介词短语等知识点的理解。[详细]

举一反三

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