--The line is busy.Someone_____the telephone. A.must have been using B.must be using 选哪个?为什么? 2.请翻译此句：--Would you have told him the answer had it been possible?--I would have,but I was so busy then.

谢绝不相关回答,请自重! 1.--I can't get through to the manager's office. --The line is busy.Someone_____the telephone. A.must have been using B.must be using 选哪个?为什么? 2.请翻译此句：--Would you have told him the answer had it been possible?--I would have,but I was so busy then.

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