3．The reason why he explained in the office was reasonable．把why換成that/which 或why去掉．

分析 他在辦公室里解釋的理由是合理的．

解答 答案是把why換成that/which 或why去掉．本題考查定語從句的引導(dǎo)詞；題干中含有以reason為先行詞的定語從句，將reason帶入到定語從句，從句完整的表達(dá)為"he explained the reason in the office"，可見the reason在從句中做賓語；做賓語指代物可以用that或which，還可以省略，why 在從句中只能做狀語，故答案是把why換成that/which 或why去掉．

點評 句子改錯要在理解句子結(jié)構(gòu)的基礎(chǔ)上從詞語搭配、詞性、單復(fù)數(shù)、時態(tài)、非謂語動詞等方面進(jìn)行綜合考慮，分析可能存在的錯誤；

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