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I_Mr.Smith since he moved to Shanghai.选哪一个,求讲解!

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I_Mr.Smith since he moved to Shanghai.选哪一个,求讲解!
A.didn"t hear from
B.don"t hear from
C.won"t hear from
D.haven"t heard from
老师讲有since时就用现在完成时,since后不是应该加时间段或延续性的话吗?可是这个句子的后面貌似不是延续性的,那么这个句子还用现在完成时吗,那么have后面是否也要跟延续性动词或根据since后面的话判断have后面跟的是延续还是不延续?求解,到初三后英语学起来吃力了.
I_Mr.Smith since he moved to Shanghai.选哪一个,求讲解!
答案：D

解析：你们老师讲的没错,有since就应该用现在完成时,since后面可以接时间状语,也可以接一个从句.since后面接的时间不是一段时间,是一个点时间,这句话中可以理解为since后面接的是他搬到上海的那一个点时间.

翻译：自从史密斯先生搬到上海后,我就没收到过他的来信.



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