问题
Shall we go out for a swim?—Sorry, I can’t. I ______ housework for my mother now.
A:am doing
B:is doing
C:are doing
D:did
B:is doing
C:are doing
D:did
正确答案是：
同类题型
The girl was born __________ the morning of May 1, 1991.[ ]
Yesterday when I _______ to the station, the train ______ already.
My boss insisted that I _______ the work before ten o’clock tonight.
______do you watch TV? —”Every afternoon”[ ]
We have friends to help us fight against pollution, and trees are one of ________.