The reason_________  he didn't come was _________ he had to take care of his sick mother.
A．why ; thatB．why ; which
C．which ; whyD．that ; for
A
本題是一道定語從句與賓語從句的交叉考查。why引導(dǎo)的從句作為句中的定語，that引導(dǎo)的從句作為句中的賓語。
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