——I can't get through to the general manager's office anyhow.<p>——The line is busy. Someone___ the telephone.</p><p>A.must use</p><p> B.uses</p><p>C.must have been using </p><p>D. must be using</p><p><br></p>

A、 B、 C、 D、

时间:2023-06-25 16:08:08

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