问题

It was several minutes _______ we realized what was happening~our dog was trapped in a newly-dug tunnel

A:since
B:before
C:until
D:while

正确答案是：

同类题型

Mr. Smith left home and went to Shenzhen in his twenties, where he _______ until the 1990s.

Cindy’s brother a ping-pong bat.

They have clothes

Mr Smith always goes for a walk with his dog when heis_________.

Who do you think is the man __________ first flewinto space in China — Yang Liwei is.