Criticism and self-criticism are necessary ______ they help us to find and correct our mistakes.

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问题 Criticism and self-criticism are necessary ______ they help us to find and correct our mistakes.

选项 A、by that
B、at that
C、on that
D、in that

答案D

解析 空格后为主谓结构的句子,且成分齐全,由各选择项观之,应为介词带宾语从句结构,连词为that,由此判定D项正确。in that为书面语,意为“既然,因为”。由 that引导的介词宾语只能跟in,but,except,besides等少数介词连用。
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