A number of tests have been conducted to _________ that these drugs have no side effects.A．find outB．look forC．make sureD．work out-高中英语-n多题

◎ 题干

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

◎ 答案

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◎ 解析

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◎ 知识点

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