I'm sorry to have kept you waiting long
问题描述:
I'm sorry to have kept you waiting long
neve mind.I ___ here for only a few minutes.
A.have been B.waited
选哪个 并排出另一个原因
答
A.现在完成时.表明现在已经完成的.几分钟前已经到了.
B缺少系动词,不正确.