– Why does she look so tired?-- She all the morning and she still hasn’t finished it.A. c

问题补充：

– Why does she look so tired?

-- She all the morning and she still hasn’t finished it.

A. cleaned

B. was cleaning

C. has been cleaning

D. has cleaned

答案：

A. cleaned

B. was cleaning

(答案→)C. has been cleaning

D. has cleaned

解析：clean这个动作，之前就发生了，一直到现在还没完成，还在继续，因此用现在完成进行时态。