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

More than a dozen workers in that company ________ to get trained last year.

Guangdong lies＿＿＿the south of China and Fujian is＿＿＿the east of itHainan is＿＿the coast of the mainland

everyone present was amused by his adventure story in Africa.

Don’t __ that all those who get good grades in the entrance examination will prove to be most successful.

osted the letter, _________he