问题

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

正确答案是：

同类题型

The number of traffic accidents caused by drunk driving is _______ as the number of those caused by other reasons

Theof the students in our classgirls.

Fifty dollars for such a T-shirt！You_____ be joking！— I’m serious. It’s made of silk.

Getting more information on how to use these tools can ______ your chances of success. [ ]

下列句子中，没有语病的一项是（）