问题补充:
Is this the reason at the meeting for his carelessness in his work?
A. why he explained
B. what he spoke
C. he explained
D. he spoke
答案:
A. why he explained
B. what he spoke
(答案→)C. he explained
D. he spoke
解析:he explained前省略了that,reason后跟了一个定语从句。