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
网友回答
(答案→)A. he explained
B. what he explained
C. how he explained
D. why he explained
解析:考查短语从句。句中先行词为the reason,在定语从句中作explain的宾语,故省略关系词,选A。