15．If Nina _____ that her husband would go to the bus stop to meet her，she wouldn't have walked back home．（　�。�
A．knowsB．knewC．has knownD．had known

分析 如果Nina早知道她的丈夫會(huì)去汽車站接她，她就不會(huì)走著回家了．

解答 答案：D 
分析句意可知，本題考查的是虛擬條件句，當(dāng)條件句表示與過去相反的事實(shí)時(shí)，要用過去完成時(shí)即：had+done的形式，主句謂語用"should （would，could，might）+have+done；根據(jù)主句的意思：她就不會(huì)走著回家了．可知，之前她不知道她的丈夫會(huì)去汽車站接她，此處從句表達(dá)了與過去相反的事實(shí)，所以要用虛擬語氣即：had+done的形式．故選D．

點(diǎn)評(píng) 本題考查的是虛擬條件句．需要注意牢記以下用法：（1）表示與現(xiàn)在事實(shí)相反，條件從句的謂語用過去式（be通常用were），主句謂語用"should （would，could，might）+動(dòng)詞原形"；（2）與過去事實(shí)相反，條件從句的謂語用過去完成時(shí)（had+過去分詞），主句謂語用"should （would，could，might）+have+done"；（3）與將來事實(shí)相反，條件從句的謂語用過去式（be通常用were），主句謂語用"should （would，could，might）+動(dòng)詞原形"．

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