Is this the reason ________ at the meeting for his carelessness in his work? A．explained B．.

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

A



试题分析：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。
点评：本题较难。非谓语动词是近几年高考的热点，本题是对已学知识点的回顾，需要考生能够理解该题的语言环境，进而作出正确的判断。会判断非谓语动词与它的逻辑主语之间是什么关系，需要考生掌握非谓语动词的不同形式的用法区别等。这里学生误选D，认为是定语从句。
即学即练：The government plans to bring in new laws _____ parents to take more responsibility for the education of their children. 
A. forced            B. forcing            C. to be forced         D. having forced 
解析：B。现在分词短语作后置定语，修饰new laws ,相当于which forces ……...

a? 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。