问题
选择题
—— I can’t get through to the general manager’s office anyhow.
—— The line is busy. Someone _____ the telephone.
A．must use
B．uses
C．must have been using
D．must be using
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—— I can’t get through to the general manager’s office anyhow.
—— The line is busy. Someone _____ the telephone.
A．must use
B．uses
C．must have been using
D．must be using
答案：D