—— I can’t get through to the general manager’s office anyhow.—— The line is busy. Someone

发布时间：2020-08-16 08:16:11


—— 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

网友回答

A. must use
B. uses
C. must have been using
(答案→)D. must be using
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