—Mrs White always helps others she is very busy. —She is so kind.A. but B. because C. alt

—Mrs White always helps others she is very busy. —She is so kind.
A. but B. because C. although

解析：A. but 但是，表示转折关系 B. because因为，表示因果关系 C. although尽管，表示让步关系；句意：尽管她很忙，怀特太太总是帮助其他人。她真的是太好了。故选C

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