I'm going to work hard-----itA.inB.atC.with

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I'm going to work hard-----itA.inB.atC.with
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I'm going to work hard-----itA.inB.atC.with
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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.

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