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I'm going to work hard-----it

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I'm going to work hard-----it
A.in
B.at
C.with
I'm going to work hard-----it
B.at
work hard at: 努力工作(或学习)
例如:
1. If you work hard at other times, you won't have to sit up all night before the exam.
你平时如果努力学习,在考试前就不必这样整夜开夜车了.

2. He worked hard at his biology.
他努力学习生物学.