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:空白处引导定语从句,先行词是reason,因B、C两项不能引导定语从句,应排除。D项有一定干扰性,因先行词为the reason,但是,从句中缺少的是explained的宾语,不用why引导,应用which或that或省略。