问题

Where is Mother–She is in the kitchen. She ______ the housework all morning.

A:is doing
B:was doing
C:has done
D:has been doing

正确答案是：

同类题型

What has ________ done since 1989. —It has built many schools for poor children .

Congratulations! Among the best picturesin the competition, I found _________. When did you draw it—During the trip to the Yellow Mountain_________ May.

.— do you play tennis — I play three times a week.

I’mcalling to enquire about the position __________in yesterday’s China Daily

Don’t forget to give me best wishes to you mother.—___________.