-- I can’t get through to the general manager’s office anyhow. -- The line is bu
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—— I can’t get through to the generalmanager’s office anyhow.
—— The line is busy. Someone _____ thetelephone.
| A.must use | B.uses | C.must have been using | D.must be using |
试题答案
【答案】
D
【解析】略