问题
选择题
Don't be too hard ______ the boy; he didn't mean it. [ ]
A. at; doing
B. on; to do
C. for; doing
D. for; to do
答案
答案：B
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Don't be too hard ______ the boy; he didn't mean it. [ ]
A. at; doing
B. on; to do
C. for; doing
D. for; to do
答案：B