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
这题考查介词的用法：be hard on“对…苛刻”，句意是：虽然你儿子犯了错，他学习很努力，你不该对他太苛刻。选C。
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