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相反，if后面省略了"I hadn't been out on business"，所以主句應該用"would+have+done"虛擬語氣，表示對過去事情的假設，意思是"本來可以做"，故選A．

點評 本題考查的是虛擬語氣．if引導的虛擬語氣題，關鍵是要根據(jù)上下文語境，找時間狀語或是看里面的關鍵詞是對什么時間的虛擬，然后再按照規(guī)則來找答案．

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