-Where is mother?-- She is in the kitchen. She the housework all morning.A. was do

问题补充：

---- Where is mother?

---- She is in the kitchen. She the housework all morning.

A. was doing

B. has done

C. has been doing

D. is doing

答案：

A. was doing

B. has done

(答案→)C. has been doing

D. is doing

解析：考查时态。根据all morning整个上午，可知应该使用现在完成进行时。句意：—你妈妈在哪里？—她再厨房。她一直在做家务。