题目内容

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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