A new product must be _________ before it comes into use.

A. given out B. tried out

C. put out D. made out

 

B

【解析】

試題分析：考查短語辨析。A. given out分發(fā)；B. tried out試驗；C. put out 撲滅；D. made out理解；句意：在產(chǎn)品投入使用之前必須經(jīng)過測試，根據(jù)提到before it comes into use故選B項。

考點 : 考查短語辨析

 

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