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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

第一空是主謂一致，Criticism and self-criticism看成整體，謂語動詞應用單數，第二空考查連詞，in that 因為，句意：批評與自我批評是必要的因為它幫助我們糾正錯誤。所以選A。

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