---Sorry indeed. I______ to your birthday party if
---Forget it. I know you were out on business.A.must eB.would eC.must have eD.would have e
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D解析这题考查虚拟语气的用法，从上下文看，说话人是没能参加生日聚会，所以用would have done，“本可以做却没做”。句意是：--真是抱歉，如果..我本可以去参加你的生日聚会的，--没事，我知道你在外做生意的。选D。