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

試題分析：考查虛擬語氣。本題考查的條件句的虛擬語氣，是與過去事實相反，條件句中使用“過去完成時”；主句使用“情態(tài)動詞+have done”句意：我在會議上沒有看見你的姐姐，如果她來參加會議，她就會遇見我的兄弟的。根據(jù)前句的didn’t see，說明本句是與過去事實相反的虛擬語氣，故D正確。
點評：if的虛擬語氣非常重要，簡要概括如下：1、表示與現(xiàn) 在事實相反的情況，從句：If主語+過去時(Be動詞用were)；主句：主語+should/would/could/might+do：　2、表示與過去事實相反的情況，從句：If主語+had+done；主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，從句：①if+主語+were to do②if+主語+should+do ③if+主語+did（動詞過去式）/were ；主句：主語+should/would/could/might+do　
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