问题
Please call study center _____ 443-5667 for more information. [ ]
A: at
B: on
C: in
D:for
B: on
C: in
D:for
正确答案是:
同类题型
He has ______ for some years, but his _____ still makes us very sad now.
It is useful to be able to predict the extent _____ a price change willaffect supply and demand.
He is honest boy. He never tells a lie.
Bob and Jim usually play football _____their spare time.[ ]
_____ of the water _____ polluted. We must try to protect our environment.