问题补充:
Is this the reason at the meeting for his carelessness in his work?
A. explained
B. what he explained
C. how he explained
D. why he explained
答案:
(答案→)A. explained
B. what he explained
C. how he explained
D. why he explained
解析:句意:这就是那个他在会议上解释的由于工作粗心的原因吗?explained at the meeting for his carelessness in his work这是定语,修饰the reason,它与explain之间是被动关系,故用过去分词。如果用定语从句必须用关系代词做explain的宾语,用that或which都行。故选A。