乌鲁木齐五十二中
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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:514

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
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I ______ have worried before I