问题

Not until____ did Humphrey begin working.

A:did it stop raining
B:had it stopped raining
C:it stopped raining
D:it stops raining

正确答案是：

同类题型

They decided to_____the partnership.[ ]

I want to help these homeless people, but I don’t know what I could them.

The environment here becomes better and better. ______ birds are coming back.

The price of petrol(汽油) is not _______ that of last year, so some more people are planning to buy cars.

You have never visited the place before, you