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    【题目】I ______ have worried before I came to the new school, for my classmates here are very friendly to me.

    A. mightn’t B. mustn’t

    C. needn’t D. couldn’t

    【答案】C

    【解析】试题分析：句意：我来新学校之前本没有必要担心，因为在这里我的同学对我非常友好。needn’t have done本没有必要做某事，表示实际上已经做了某事。根据句意可知选C。

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