问题

It was not until the beginning of the twentieth century________to explore space.

A:did man begin
B:when man began
C:that man began
D:then man began

正确答案是：

标签： man , until , was

同类题型

This dictionary is different _____ that one.[ ]

Now the government is trying to solve the problem the school bus safety. — So we believethere will be fewer accidents in future.

I learnt the bad news that another serious coal mine disaster happened a cold winter evening.[ ]

Zhou Libo’s talk show is very funny. It often makes people_________.

Where is the library?—It’ s the hospital.