【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】句意：我來(lái)新學(xué)校之前本沒有必要擔(dān)心，因?yàn)樵谶@里我的同學(xué)對(duì)我非常友好。needn't have done 本沒有必要做某事，表示實(shí)際上已經(jīng)做了某事。根據(jù)句意可知選C。

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