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12.I was really anxious about you,you _____home without a wo

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12.I was really anxious about you,you _____home without a word.
A.mustn’t leave\x05
B.shouldn’t have left\x05
C.couldn’t have left
D.needn’t leave
选B为什么
为什么要用完成时
12.I was really anxious about you,you _____home without a wo
shouldn't have done本不应该做而做了;我真的很担心你,你本不该一句话也不说就离开家的.A不准离开C不可能离开D不必离开 这并不是指完成式,而是虚拟语气的几种结构.重点,一定要记牢