题目内容：

I'm going to work hard-----it
A.in
B.at
C.with

优质解答

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 har...