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Câu hỏi:

03/07/2024 85

The line is busy; someone______ the telephone now.

A. must be using    

Đáp án chính xác

B. must have used 

C. must used    

D. must have been using

Trả lời:

verified Giải bởi Vietjack

Chọn đáp án A

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