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

分析 她以前去過(guò)上海,是嗎?

解答 答案:B.
根據(jù)She's been to Shanghai before,        ?可知本句考查了反意疑問(wèn)句:要遵循"前肯后否,前否后肯"的原則,在這里before一般用于現(xiàn)在完成時(shí)之中,has/have been to指去過(guò)某地,所以這里She's 是she has的縮寫(xiě);因?yàn)檫@個(gè)句子里面含有has,所以疑問(wèn)句還用has,She's been to Shanghai before是肯定句,后面必須用否定式,主語(yǔ)仍為she.故選B.

點(diǎn)評(píng) 要熟記反意疑問(wèn)句要遵循"前肯后否,前否后肯"的原則,還要選好恰當(dāng)?shù)闹鷦?dòng)詞.有了系動(dòng)詞、情態(tài)動(dòng)詞或助動(dòng)詞的可以直接用.

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