i ( ) a letter form him since he left A.didn't B.haven't got C.difn't have D.haven't heard选B的理由 receive a letter 延续性是什么 get不也是非延续动词么

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i ( ) a letter form him since he left A.didn't B.haven't got C.difn't have D.haven't heard选B的理由 receive a letter 延续性是什么 get不也是非延续动词么
i ( ) a letter form him since he left A.didn't B.haven't got C.difn't have D.haven't heard
选B的理由 receive a letter 延续性是什么 get不也是非延续动词么

i ( ) a letter form him since he left A.didn't B.haven't got C.difn't have D.haven't heard选B的理由 receive a letter 延续性是什么 get不也是非延续动词么
由since可判断出是完成时,排除AC
然后用D是重复,所以选B

since he left表示从过去的某个时间开始到说话时的一段时间，所以不能用一般过去时态，排除A和C；hear from本身就表示“收到……的来信”，所以不能再出现a letter，排除D。
注意：非延续性动词的肯定句不能和时间段连用，否定句表示状态可以和时间段连用。非延续性动词在否定句中表示状态可以和时间段连用？所以get也可以了是吗yes...

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since he left表示从过去的某个时间开始到说话时的一段时间，所以不能用一般过去时态，排除A和C；hear from本身就表示“收到……的来信”，所以不能再出现a letter，排除D。
注意：非延续性动词的肯定句不能和时间段连用，否定句表示状态可以和时间段连用。

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