You have to explain ____ us the reason _____ your being absent from school yesterday.
A.to; of
B.to; why
C.for; that
D.to; for
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D解析explain sth to sb 把......向某人解释，所以第一空用to；the reason _____ your being absent from school yesterday.你昨天上学迟到的原因，……的原因，用for the reason。所以选D。