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
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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。