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

A
解析：
the reason后可用關系代詞that引導定語從句．也可用關系副詞why引導定語從句.在該句中，因為引導定語從句的關系代詞that作 explained的賓語，所以可以省略掉.這句意思是“這就是他在會議上對他為什么在工作上粗心大意的理由所作的解釋嗎?”最佳答案為A.

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