题目

 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 答案：【解析】选A。考查先行词reason后定语从句关系词的选用。分析句子结构可知, the reason后的定语从句中动词explained缺少宾语, 故用that或which引导, 而不用why; 又因为关系代词充当宾语时可以省略, 故选A。

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