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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
考查虛擬語氣。句意:我不知道你們是好朋友!悴豢赡苤。自從那移居到這兒我就認識他。那時你在國外!癱ould+have+done”是虛擬語氣,表示對過去事情的假設。。故選C。
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