In order to get the exact result, the scientists made _______.A．a lot triesB．to_刷题宝

题干

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

上一题下一题 0.85难度单项选择更新时间:2010-07-05 12:12:59

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