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

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The reason ( ) I have to go is ( ) my mother is ill in bed
A:why ,why B:why ,Because C:why ,that D:that ,Because

来来,分析句子~
主句：The reason is ————
整个句子有三个谓语,哪个才是主句的谓语呢?（做得多就知道了
这里is是主句的谓语,那么,其他的谓语都是从句的谓语了
既然确定了is是主句的谓语,那么is后面的就是表语从句了.
表语从句my mother is ill in bed,这是一个完整结构的句子,而且是个陈述句,所以引导词用that
答案呼之欲出,C
另外,reason后面的是定语从句,用why来引导（reason作先行词,在从句中充当原因状语,引导词用why
再另外,为什么不用because,因为它是个连词,用来连接句子或者相同的句子成分,而且reason已经有原因的意思了,再用because就意思重复了

My mother is ill in bed.I(have)to look after her.对不对 My mother is ill in bed.I have to look after her.(作出反映） -I can't go to your party .My mother is ill and i have to lo My father is ill in bed.I have to look after____at home.( ) My mother is a( ).I have ( )for lunch.I go to bed at( ).该怎样填 My mother is ill so I have to take her to the 什么（h开头） --why are you in a hurry?--______ my mother is ill,I have to Mother is ill in bed. I have to__ her at home. 横线上填什么? My mother is ill.I must take her_A,in hospital B,to the hosp my mother is ill in the hospital和my mother is ill in hospita I have a good bed in my room.Next to the bed is a desk.I hav I'd ()(),() my mother is ill ,so I have to look arter her at