Is this reason ___ at the meeting for his carelessness in his wor_英语解答

Is this reason ___ at the meeting for his carelessness in his work
Is this reason ___ at the meeting for his carelessness in his work
A.he explained B.the one he explained C.how he explained D.Why he explained

人气：228 ℃　时间：2019-11-06 05:01:23

解答

这是一个定语从句的疑问句,the reason是主语,后面的at the meeting for his carelessness in his work 是定语,翻译成中文就是这就是他在会议上为其工作上的失误所解释的原因?
how是如何,why是为什么,明显不符合题意可以排除.
the one是代词,指代this reason.不可以缺少,故选B.