Question

Helen _____ her keys in the office so she had to wait until her husband _____ home.

[　　]

A．had left; comes

B．left; had come

C．had left; came

D．had left; would come

Answer 1

答案：
解析：

完成时表示的动作发生一般时之前．第一空用完成时，第二空用一般时．因为此题是在叙述一件发生过的事，应在过去时中选择两个相应的时态，即过去完成时，一般过去时．