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_______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

B

解析试题分析:考查强调句的特殊问句和比较级:强调句的特殊疑问句式是:特殊疑问词+is/was it that+其他部分?句意:为什么(怎么)她不像以前一样那么高兴,像…一样 ="==" as ...as(陈述句) ="==" so ...as(否定句),选项D中的what不能和前面的so构成同级比较,因此B项正确。
考点:考查强调句的特殊问句和比较级

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