In order to get the exact result, the scientists made .A. a lot triesB. to do experiments

发布时间：2020-08-16 13:12:38

In order to get the exact result, the scientists made     .
A. a lot tries
B. to do experiments
C. trial and error
D. great try

网友回答

A. a lot tries
B. to do experiments
(答案→)C. trial and error
D. great try
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