问题
选择题
Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
A．by that
B．at that
C．on that
D．in that
答案
答案：D
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Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
A．by that
B．at that
C．on that
D．in that
答案：D