题型： 选词填空题 难度： 一般
    【题文】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
    【解析】考查固定短语。Be hard on…对。。。苛刻，要求严格。尽管你的儿子有些错误，他很努力学习。你不应该对他太苛刻。