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.—I did not know you were good friends.
—You___.I have known her since she moved here.You were abroad then.
A.may haveB.needn’t haveC.couldn’t haveD.must have
C
考查虚拟语气。句意:我不知道你们是好朋友。——你不可能知道。自从那移居到这儿我就认识他。那时你在国外。“could+have+done”是虚拟语气,表示对过去事情的假设。。故选C。
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