Is this the reasonat the meeting for his carelessness in his work?A. he explainedB. what h

问题补充：

Is this the reasonat 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：这题考查定语从句的用法：先行词是the reason，定语从句中explain缺少宾语，所以可以用which或that引导定语从句，也可以省略关系代词，所以选A。