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
网友回答
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。