l regret_come to you birthday party .a.unable to b.to unable

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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

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

l regret_come to you birthday party .a.unable to b.to unable Unable to unable to establish a connection Unable to write to unable to connect to I regret( )that I'm unable to help you.A.saying B.to say C.s unable to write unable to recover toc unable to extract installer unable to connect是什么意思 unable to process request. UNABLE TO PYOCESS REQUEST