I’m very sorry ______ the whole morning.I forgot the appointment.A) to keep you wait B) to have kept you waiting C) to keep you wait D) to keep you wait

I’m very sorry ______ the whole morning.I forgot the appointment.
A) to keep you wait B) to have kept you waiting
C) to keep you wait D) to keep you wait

答案 B
be sorry to do 很抱歉做什么事
句意分析：我非常抱歉（）整个早上,我忘记约会了.
从上下文分析,是我“让人家一直等了整个早上”,让人家一直做什么事,keep sb doing
已经让人家等了一上午,已经发生了的事再说抱歉,动作有前后,先发生的动作（让人等候）要用完成时,所以是：to have kept you waiting

B

B
我很抱歉早上让你一直干等了。
keep sb doing sth
因为是早上发生过且持续到说话时，所以用have done sth

B。 keep sb doing 让某人一直做某事
I'm sorry + to do sth
to have done表示事情已经发生了，这叫做不定式的弯成式
对比起让你一直等了整个上午