Is this the reasonat the meeting for his carelessness in his work?A. he explainedB. what h

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(答案→)A. he explained
B. what he explained
C. how he explained
D. why he explained
解析：这题考查定语从句的用法：先行词是the reason，定语从句中explain缺少宾语，所以可以用which或that引导定语从句，也可以省略关系代词，所以选A。