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

问题补充：

she is not so cheerful she used to be?

A. How it is that；as

B. How is it that；as

C. Is it why；that

D. Why is it that；what

答案：

A. How it is that；as

(答案→)B. How is it that；as

C. Is it why；that

D. Why is it that；what

解析：B

解析句意为：她怎么不像过去那样高兴了呢？强调句的特殊疑问句式：特殊疑问词＋is/was it that＋原句剩余部分？D项中的what不正确。