–Nancydoesn’tlookverywell.What’swrongwithher?--Shehasa...

问题详情：

 –Nancy doesn’t look very well. What’s wrong with her?

--She has a terrible headache because she         too long. She should stop to have a good rest.

A. has been working     B. had worked    C. is working    D. was working

【回答】

A

知识点：动词时态与语态

题型：选择题