Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.
A．is, in thatB．a(chǎn)re, in thatC．is, in whichD．a(chǎn)re, at that
A
第一空是主謂一致，Criticism and self-criticism看成整體，謂語(yǔ)動(dòng)詞應(yīng)用單數(shù)，第二空考查連詞，in that  因?yàn)椋湟猓号u(píng)與自我批評(píng)是必要的因?yàn)樗鼛椭覀兗m正錯(cuò)誤。所以選A。
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