问题
选择题
I'm sorry to keep you _____ so long. [ ]
A. wait
B. to wait
C. waiting
D. waited
答案
答案：C
搜题请搜索小程序“爱下问搜题”
I'm sorry to keep you _____ so long. [ ]
A. wait
B. to wait
C. waiting
D. waited
答案：C