I don't think the experiment is ___ failure, because it has provided us with ___

题干

I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests．

A．不填; 不填

B．不填; a

C．a; 不填

D．a; a

上一题下一题 0.85难度单项选择更新时间:2013-11-01 02:17:54

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