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The scientist the experiment for half a year, but he yet.A.made; didn’t succeedB

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The scientist the experiment for half a year, but he yet.A.made; didn’t succeedB

The scientist __________ the experiment for half a year, but he _______ yet.

A.made; didn’t succeedB.made; hasn’t succeeded
C.was making; didn’t succeedD.has been making; hasn’t succeeded

试题答案

D

解析