—— 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 |
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—— 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 |