she is not so healthy           she used to be?
A．How it is that; asB．Why is it that; as
C．Is it why; thatD．How is it that; what
B

試題分析：考查強調(diào)句型。It is ...that...是強調(diào)句型，強調(diào)句型有一般疑問和特殊疑問形式，特殊疑問形式是“特殊疑問詞+is it ...that?”。句意：她為到底什么沒有以前那么健康？強調(diào)句強調(diào)的是原因，not so/as...as不如......。故選B。
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