问题
选择题
____ 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
答案
D
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。