The reason I have to go is my mother is ill in hospital. A. why ; why B. why; because C.

问题补充：

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

A. why ; why

B. why; because

C. why ; that

D. that; because

答案：

A. why ; why

B. why; because

(答案→)C. why ; that

D. that; because

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