单项选择题

He didn't look well, for he（）for sixteen hours.

A．had worked
B．would have worked
C．was working
D．had been working

<上一题 目录 下一题>
热门 试题

单项选择题
He didn't realize the value of friendship（）he had lost it.

A．if
B．as
C．while
D．until
相关试题