问题
选择题
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
此题考查定语从句的基本结构，本句先行词是reason，为从句谓语的逻辑宾语，故引导词用that，that可以省略。选A。