◎ 题干
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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“听音,选出你认为高或矮的朋友。( ) 1. A. B. ( ) 2. A. B. ( ) 3. A. B. ( ) 4. A. B.…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。