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　　【We---theletteryesterday,butitdidn'tarriveA.oughttoreceiveB.oughttohavereceivedC.musthavereceivedD.mustreceive】

　　We---theletteryesterday,butitdidn'tarriveA.oughttoreceiveB.oughttohavereceivedC.musthavereceivedD.mustreceive

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2020-01-2611:43

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李学全

　　B.oughttohavereceived

　　我们本应该昨天就收到信的,(事实上没收到,所以是虚拟语气,后面也说了:)但它(指信)没到.

　　所以,是B

　　A,不是虚拟不行.

　　C一定收到,意思不对.

　　D一定要收,不是虚拟也不行.

2020-01-26 11:44:59

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