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】

試題分析：考查動詞短語辨析。A發(fā)現(xiàn)，查明；B尋找；C確保；D制定出，鍛煉；句意：為了確保這些藥物沒有副作用，進(jìn)行了很多的測試。根據(jù)句意說明C正確。

考點(diǎn)：考查動詞短語辨析

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