问题

（题文）Jack ________ in the lab when the power cut occurred.

A:works
B:has worked
C:was working
D:would work

正确答案是：

同类题型

Tom is ______ English boy.

May I use your bike —_____

No one knows how the huge rocks _______ and _______ without our modern machines eight hundred years ago.

Wherethe traffic accident happened? -At the entrance to the cinema. [ ]

下面各句中加点词语的解释有误的一项（）