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Criticism and self-criticism is necessary _______ it helps us to find and correct our mistakes.
A、by that
B、at that
C、on that
D、in that
【正确答案】：D
【题目解析】： 本题为状语从句,in that是固定搭配,意思是“由于,因为”,用于引导原因状语从句,所以选项D与题意相符。