He's read this book before, ______?
A. hasn't he   B. doesn't he   C. isn't he
A

試題分析: 反義疑問(wèn)句一般遵循前肯定則后否定,前否定則后肯定,疑問(wèn)部分時(shí)態(tài),人稱要與前文保持一致。前文為肯定,故后面要用否定形式。結(jié)合時(shí)間狀語(yǔ)before可知句子為完成時(shí)態(tài),故疑問(wèn)部分也要用完成時(shí)態(tài),故選A。
點(diǎn)評(píng):本題關(guān)鍵點(diǎn)在于對(duì)前文時(shí)態(tài)的判斷,判斷時(shí)態(tài)有多種方法,如時(shí)間詞,上下文語(yǔ)境等,本題就是憑借時(shí)間詞before判斷出前文為完成時(shí)態(tài),平時(shí)需加強(qiáng)練習(xí)。
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