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。