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    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 --真的对不起，我本来可以回来参加你的生日的，如果…--算了吧！我知道你在出差．

    解答 答案：A．根据I know you were out on business可知这里与过去事实相反，if后面省略了"I hadn't been out on business"，所以主句应该用"would+have+done"虚拟语气，表示对过去事情的假设，意思是"本来可以做"，故选A．

    点评 本题考查的是虚拟语气．if引导的虚拟语气题，关键是要根据上下文语境，找时间状语或是看里面的关键词是对什么时间的虚拟，然后再按照规则来找答案．

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