The reason       I have to go is        my mother is ill in bed.
A．why...whyB．why...because
C．that...because D．why...that
D

試題分析：考查定語從句和表語從句：句意：我不得不走了的原因是我母親生病在床。the reason后面跟一個定語（從句），The reason is that my mother is ill in bed. 用why引導(dǎo)定語從句，第二空是表語從句的連接詞：原因是什么？是一個事實(shí)，這個事實(shí)用that引導(dǎo)，選D。
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