（2010·长春模拟) she is not so cheerful she used to be?
A. How is it that；as
B. Why is it that；what
C. Is it why；that
D. How it is that；as
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(答案→)A. How is it that；as
B. Why is it that；what
C. Is it why；that
D. How it is that；as
解析：这题考查强调句的特殊问句，句型是疑问词+is it+that…,第二空是as是“正如“,句型是：她是怎么不像她过去的那样愉快的。选A。