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20.She's been to Shanghai before,        ?(  )
A.isn't sheB.hasn't sheC.has she

分析 她以前去过上海,是吗?

解答 答案:B.
根据She's been to Shanghai before,        ?可知本句考查了反意疑问句:要遵循"前肯后否,前否后肯"的原则,在这里before一般用于现在完成时之中,has/have been to指去过某地,所以这里She's 是she has的缩写;因为这个句子里面含有has,所以疑问句还用has,She's been to Shanghai before是肯定句,后面必须用否定式,主语仍为she.故选B.

点评 要熟记反意疑问句要遵循"前肯后否,前否后肯"的原则,还要选好恰当的助动词.有了系动词、情态动词或助动词的可以直接用.

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