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I didn’t see your sister at the meeting. If she __________, she would have met my brother.
A.has comeB.did comeC.comeD.had come
D

试题分析:考查虚拟语气。本题考查的条件句的虚拟语气,是与过去事实相反,条件句中使用“过去完成时”;主句使用“情态动词+have done”句意:我在会议上没有看见你的姐姐,如果她来参加会议,她就会遇见我的兄弟的。根据前句的didn’t see,说明本句是与过去事实相反的虚拟语气,故D正确。
点评:if的虚拟语气非常重要,简要概括如下:1、表示与现 在事实相反的情况,从句:If主语+过去时(Be动词用were);主句:主语+should/would/could/might+do: 2、表示与过去事实相反的情况,从句:If主语+had+done;主句:主语+should/would/could/might+have done 3、表示对将来情况的主观推测,从句:①if+主语+were to do②if+主语+should+do ③if+主语+did(动词过去式)/were ;主句:主语+should/would/could/might+do 
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