10．-Sorry indeed，I________ to your birthday party if…
-Forget it．I know you were out on business．（　�。�
A．would have comeB．should comeC．could comeD．must have come

分析 --真的對(duì)不起，我本來可以回來參加你的生日的，如果…--算了吧！我知道你在出差．

解答 答案：A．根據(jù)I know you were out on business可知這里與過去事實(shí)相反，if后面省略了"I hadn't been out on business"，所以主句應(yīng)該用"would+have+done"虛擬語氣，表示對(duì)過去事情的假設(shè)，意思是"本來可以做"，故選A．

點(diǎn)評(píng) 本題考查的是虛擬語氣．if引導(dǎo)的虛擬語氣題，關(guān)鍵是要根據(jù)上下文語境，找時(shí)間狀語或是看里面的關(guān)鍵詞是對(duì)什么時(shí)間的虛擬，然后再按照規(guī)則來找答案．

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