________ she is not so cheerful ________ she used to be?
A．How it is that；asB．How is it that；as
C．Is it why；thatD．Why is it that；what
B
B
解析　句意為：她怎么不像過去那樣高興了呢？強調(diào)句的特殊疑問句式：特殊疑問詞＋is/was it that＋原句剩余部分？D項中的what不正確。
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