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：C
解析：

从两个动作发生的先后顺序来看，忘记钥匙在前，丈夫回来在后，所以前面用过去完成时态，后面用一般过去时态。