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

发布时间：2020-08-15 03:04:39

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

网友回答

A. find out
B. look for
(答案→)C. make sure
D. work out
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