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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?
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。
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