The reason  　　he was absent from class was   　 his mother fell ill this morning.
A．for; thatB．why; thatC．for; becauseD．why; because
B

試題分析：考查定語從句和表語從句：句意：他昨天曠課的原因是他媽媽早上病了。先行詞是The reason，定語從句缺少原因狀語，用why引導(dǎo)定語從句，第二空是表語從句，主語是the reason的時候，表語從句用that引導(dǎo)，選B.
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