to America, her parents have not heard from her.
A. Because she went
B. After she went
C. When she went
D. Since she went
网友回答
A. Because she went
B. After she went
C. When she went
D. Since she went
解析：题意：自从她去了美国，她父母从来没有收到她的来信。since意为“自从”，引导时间状语从句。在由since 引导的主从复合句中，从句用一般过去时，主句用想在完成时。