Is this the reason at the meeting for his carelessness in his work?A. he explainedB. what

问题补充：

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：

(答案→)A. he explained

B. what he explained

C. how he explained

D. why he explained

解析：首先判断到底引导的什么从句，第一步应先将反问句还原成陈述句，This is the reason at the meeting for his carelessness in his work。句意：他工作粗心是他在会议上解释的原因吗？很明显是定语从句。先行词the reason,引导词that作宾语省略。故选A。