问题
选择题
Although your son made some mistakes, he worked hard at his lessons. You shouldn't be hard ______ him. [ ]
A. in
B. at
C. on
D. for
答案
答案：C
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Although your son made some mistakes, he worked hard at his lessons. You shouldn't be hard ______ him. [ ]
A. in
B. at
C. on
D. for
答案：C