The reason I have to go is my mother is ill in bed．

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问题 The reason ______ I have to go is ______ my mother is ill in bed．

选项 A、why；why
B、why；because
C、why；that
D、that；because

答案C

解析 I have to go是定语从句，先行词是the reason，因此引导词用why，表示原因，排除D项。my mother is ill in bed是表语从句，说明主语the reason是什么，表示一个事实而不是原因。that在引导的表语从句中充当连词的作用，没有实际意义，不作句子成分，故选C。

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