【題目】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】試題分析：句意：我來新學校之前本沒有必要擔心，因為在這里我的同學對我非常友好。needn’t have done本沒有必要做某事，表示實際上已經(jīng)做了某事。根據(jù)句意可知選C。

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