l regret_come to you birthday party .a.unable to b.to unable to c.be unable d.being unable to

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l regret_come to you birthday party .a.unable to b.to unable to c.be unable d.being unable to
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l regret_come to you birthday party .a.unable to b.to unable to c.be unable d.being unable to
l regret_come to you birthday party .a.unable to b.to unable to c.be unable d.being unable to

l regret_come to you birthday party .a.unable to b.to unable to c.be unable d.being unable to
选D
首先要知道,regret这个词后面,如果用非谓语动词作宾语,只能有两种形式,即不定式和现在分词.其中不定式一般理解为表示未做的事,现在分词一般理解为表示已做的事.
unable是一个形容词,显然不可以直接做regret的宾语,所以A项排除.C项中be是原型,也不可以作宾语,排除.
B项,不定式表示未做之事,例如“I regret to tell you that you have failed.”(我很遗憾告诉你,你失败了).这个句子里面,“tell”是未做而将做之事,所以用了不定式.而在这个句子里面,没有去生日聚会很明显是已经发生过的事,所以要用现在分词.故选D