I'm sorry I have ____ you waiting.

问题描述:

I'm sorry I have ____ you waiting.
A.kept
B.made
C.let
D.asked

A
i'm sorry (that)后面是从句
i have 后面接动词的过去分词形式 kept 即keep的过去分词
make,let,ask sb.9(to) do sth.不能用doing.