问题

Not until he left his home ______ to know how important the family was for him.

A:had he begun
B:did he begin
C:he began
D:he had begun

正确答案是：

同类题型

t help people to find houses outside the city, but __________, we must remember that some city people want to remain where they are.

To keep you______, you’d better ______ helmet(头盔) when you skate on real ice.

, how shall I ________， not fat but rather well built.

What’s that man in a black shirt — _____________.

____many times, he finally understood it.