The reason being late for the meeting was his little son fell ill this morning.
A. for, that
B. why, that
C. for, because
D. why, because
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(答案→)A. for, that
B. why, that
C. for, because
D. why, because
解析：考查介词用法和表语从句，the reason与介词for连用，for后面接动名词的形式。第二空是由that引导的表语从句，句意：他会议迟到的原因是他的小儿子今天上午突然生病了。故A正确。注意没有The reason is because…的句式。