问题
You will find what great benefit the computer you own can be________each time you use it to help you work.[ ]
A: for
B: at
C: on
D: of
B: at
C: on
D: of
正确答案是：
同类题型
The old woman died of cold ________a cold night.
Dick, I’m sorry but I have to leave. —_______. I hope to hear from you soon.
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Please never do such things _______ other people.
When he entered the room, he found Mary at the desk, reading.