-------I’m sorry I could not go to your birthday party yesterday.
-------- . I know you are very busy recently.
A Go ahead. B No kidding. C Forget it. D Not really.
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解析：考查交际用语。Go ahead.用吧，No kidding.别开玩笑了，Forget it.得了吧，算了吧，Not really.不完全是，句意：很抱歉我没能参加你昨天的生日聚会。算了吧，我知道你最近很忙。故选C。