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A number of tests have been conducted to _______ that these drugs have no side effects.

A. find out B. look for

C. make sure D. work out

C

【解析】

试题分析:考查动词短语辨析。A发现,查明;B寻找;C确保;D制定出,锻炼;句意:为了确保这些药物没有副作用,进行了很多的测试。根据句意说明C正确。

考点:考查动词短语辨析

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