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17._______ different life today is from what it was fifty years ago!(  )
A.WhatB.What aC.HowD.How a

分析 今天的生活与50年前的生活是多么不一样啊!

解答 答案:B.
考查感叹句.感叹句结构:what+a/an+形容词+名词!how+形容词+a/an+名词!结合题干,由后面的it可知life为单数名词,故选B.

点评 本题考查感叹句的用法.感叹句只能由how和what引导,区分原则是how修饰形容词,what修饰名词.

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