【题目】Is this the reason______ at the meeting for his carelessness in his work?
A. he explainedB. how he explainedC. what he explainedD. why he explained
在线课程【答案】A
【解析】
考查关系代词。句意:这就是他在会上解释他工作粗心的原因吗？分析句子可知，本句为定语从句，先行词为the reason，在后面的定语从句中作explain的宾语，所以关系代词that/which 被省略。故A选项正确。