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

Is this the reason at the meeting for his carelessness in his work?
A. he explained
B. what he explained
C. how he explained
D. why he explained

(答案→)A. he explainedB. what he explainedC. how he explainedD. why he explained解析：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。

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