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Is this the reason _______ he was late for the meeting?

A. why B. when C. where D. what

A

【解析】

試題分析:考查定語從句。先把原句改為陳述句:This is the reason________ he was late for the meeting.,可以看出,先行詞是the reason,定語從句“he was late for the meeting”是主系表結構,不缺少成分,用關系副詞why引導,what不用于定語從句,故選A。

考點:考查定語從句

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