_______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

試題分析：考查強調(diào)句的特殊問句和比較級：強調(diào)句的特殊疑問句式是：特殊疑問詞+is/was it that+其他部分？句意：為什么（怎么）她不像以前一樣那么高興，像…一樣 ="==" as ...as（陳述句） ="==" so ...as（否定句）,選項D中的what不能和前面的so構(gòu)成同級比較，因此B項正確。
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