问题

6．— Is there any possible way to help them get rid of such a bad habit? — To tell the truth, it’s very hardBut we teachers________on this problem

A:are working
B:had worked
C:worked
D:had been working

正确答案是：

同类题型

When they got there, they found the people suffering the storm were________food and water supplies.[ ]

You can’t imagine________ when they finished climbing the high mountain.

Let’s have a party this Sunday.—_______. We’ll have a good time.

下列加点词语读音全都正确的一项是（）

It’s thirty years since we last met. —But I still remember the story, believe it or not,_______ we got lost on a rainy night.