问题
We knock _____people’s doors, and they usually give us some candy ______ a treat.[ ]
A: on, to
B:, at, to
C: on, as
D:on, on
B:, at, to
C: on, as
D:on, on
正确答案是：
同类题型
I could look after ____ when I was five.— Really? I can’t believe it.
Her birthday is ____________ July 2. And my birthday is also ____________ that month.[ ]
Tomorrow there’s a programmed about our school on TV，then it ____ by millions of people．
I plan to go to Beijing _____ plane. [ ]
When did Hong Kong return to our motherland? — ____ 1997. [ ]