Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.

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问题 Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.

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

答案D

解析本题测试复合介词。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。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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