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(yǔ)氣。本題考查的條件句的虛擬語(yǔ)氣，是與過(guò)去事實(shí)相反，條件句中使用“過(guò)去完成時(shí)”；主句使用“情態(tài)動(dòng)詞+have done”句意：我在會(huì)議上沒(méi)有看見(jiàn)你的姐姐，如果她來(lái)參加會(huì)議，她就會(huì)遇見(jiàn)我的兄弟的。根據(jù)前句的didn’t see，說(shuō)明本句是與過(guò)去事實(shí)相反的虛擬語(yǔ)氣，故D正確。
點(diǎn)評(píng)：if的虛擬語(yǔ)氣非常重要，簡(jiǎn)要概括如下：1、表示與現(xiàn) 在事實(shí)相反的情況，從句：If主語(yǔ)+過(guò)去時(shí)(Be動(dòng)詞用were)；主句：主語(yǔ)+should/would/could/might+do：　2、表示與過(guò)去事實(shí)相反的情況，從句：If主語(yǔ)+had+done；主句：主語(yǔ)+should/would/could/might+have done　3、表示對(duì)將來(lái)情況的主觀推測(cè)，從句：①if+主語(yǔ)+were to do②if+主語(yǔ)+should+do ③if+主語(yǔ)+did（動(dòng)詞過(guò)去式）/were ；主句：主語(yǔ)+should/would/could/might+do　
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