◎ 题干
Is that the reason ______ at the meeting for his carelessness in his work? Actually we think he is a man who
is hard ______ himself especially in work.
[     ]
A. that he explained to all; on
B. what he explained all; with
C. why he explained to all; at
D. which he explained to all; to
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◎ 解析
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◎ 知识点
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