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Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

A.is, in that B.are, in that C.is, in which D.are, at that 

A

解析第一空是主谓一致,Criticism and self-criticism看成整体,谓语动词应用单数,第二空考查连词,in that  因为,句意:批评与自我批评是必要的因为它帮助我们纠正错误。所以选A。

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