____ to America, her parents have not heard from her.
A.Because she wentB.After she wentC.When she wentD.Since she went
D  
題意:自從她去了美國,她父母從來沒有收到她的來信。since意為“自從”,引導時間狀語從句。在由since 引導的主從復(fù)合句中,從句用一般過去時,主句用想在完成時。
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