7．He's posted the letter，_________ he？（　�。�
A．isn'tB．doesn'tC．hasn'tD．wasn't

分析 他已經(jīng)把信寄掉了，對嗎？

解答 答案是C．本題考查省略句的反義問句．反義問句的基本結(jié)構(gòu)是"陳述句+簡略疑問句？"，陳述句用肯定，則疑問句用否定；陳述句用否定，疑問句用肯定；疑問句中的主語和助動詞與陳述句一致；題干中"He's posted"完整的表達(dá)是"He has posted"，故問句中的主語和助動詞與"He has"一致，所以答案選擇C．

點(diǎn)評 反義問句的解題，首先理解反義問句的作用--證實(shí)上文的內(nèi)容；其次理解反義問句的基本結(jié)構(gòu)；并且積累常見的特殊結(jié)構(gòu)，最后結(jié)合語境判斷．

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