she is not so healthy she used to be?A. How it is that; asB. Why is it that; asC. Is it w

问题补充：

she is not so healthy she used to be?

A. How it is that; as

B. Why is it that; as

C. Is it why; that

D. How is it that; what

答案：

A. How it is that; as

(答案→)B. Why is it that; as

C. Is it why; that

D. How is it that; what

解析：考查强调句型。It is ...that...是强调句型，强调句型有一般疑问和特殊疑问形式，特殊疑问形式是“特殊疑问词+is it ...that?”。句意：她为到底什么没有以前那么健康？强调句强调的是原因，not so/as...as不如......。故选B。