问题
Man must keep in mind that it will be years ______ the earth recovers from the damage he makes to it.[ ]
A: when
B: before
C: since
D: until
B: before
C: since
D: until
正确答案是：
同类题型
Tom is a hard-working student．In fact, you cannot find anyone in the class ____．
Doyou mind my opening the window for a while—_______
Tony used to _______ to school, but he is used to_______ to school now.
Our headmaster acceptedthe suggestion by students.
How do you find the match between Spain and Switzerland?—It’s ！ Powerful Spain lost the game by 0∶1.