2. 外语
  3. Criticism and self-criticism are necessary______they help us to find and correct our mistakes.

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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