问题描述：
3.Is this the reason_______ at the meeting .
3.Is this the reason_______ at the meeting for his carelessness in his work? A.he explained B.what he explained C.how he explained D.why he explained
3.Is this the reason_______ at the meeting for his carelessness in his work? A.he explained B.what he explained C.how he explained D.why he explained
问题解答：
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