问题

Where is Mother—She is in the kitchen. She ______the housework all morning.

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

正确答案是：

同类题型

Have you got any particular plans for the coming holiday— Yes. ______, I’m going to visit some homes for the old in the city.

It is time for class. Let’s stop _______.

We’re tired because we have ________ yin.

He had a visitto Amecia last year.

Once harm is _______ to the eco-system, all species will ________, including man himself.