问题
Tom, clean up the broken glass _________ someone walks on it
A:since
B:when
C:before
D:as
B:when
C:before
D:as
正确答案是:
同类题型
Out of______ for the wounded dog, Alice decided totake the abandoned animal home for treatment.
There was a lot of fun at last night’s party. You ____ have come, but why didn’t you? [ ]
The doctor did what he could _______ the boy, but in vain.
Our world will get better and better each of us lives a greener life.