问题
选择题
Helen ________ her keys in the office so she had to wait until her husband ______ home.
A．has left; comes
B．left; had come
C．had left; came
D．had left; would come
答案
答案：C
题目分析：句意：海伦把钥匙落在办公室了，所以她得等自己的丈夫回家
根据主句和从句两个动词的先后顺序可以判断，丢钥匙在前，回家再后，且都为过去式，所以前者用过去完成时，后者用一般过去式
考点:考察动词时态的用法
点评：动词时态一直以来都是全国各省高考考查的重头戏，考生在此一定要多下工夫，将每一种时态的定义和用法吃透。平时，加强对该类题的练习.