Question

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

Answer 1

答案：C
提示：

该句说明的是发生过的事情，不能使用现在时态，可排除A项；从时间关系判断，“掉钥匙”发生在“等丈夫回家”之前，所以第一个空用过去完成时，第二个空用一般过去时。