I’m terribly sorry to keep you（ ）so long.
A、
waiting
B、
wait
C、
to wait
D、
from waiting
【正确答案】：A
【题目解析】：
keep sb. doing sth.：让某人一直做某事，选A。句意：很抱歉让你等了这么久。
I’m terribly sorry to keep you（ ）so long.
I’m terribly sorry to keep you（ ）so long.
waiting
wait
to wait
from waiting
keep sb. doing sth.：让某人一直做某事，选A。句意：很抱歉让你等了这么久。