问题
选择题
I’m sorry I delayed_________ your letter because I have been quite busy these days.
A．to answer
B．to have answered
C．answering
D．answered
答案
答案：C
搜题请搜索小程序“爱下问搜题”
I’m sorry I delayed_________ your letter because I have been quite busy these days.
A．to answer
B．to have answered
C．answering
D．answered
答案：C