Jack must (go) ______ away—we can’t find him anywhere in the factory.have gone本题

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问题 Jack must (go) ______ away—we can’t find him anywhere in the factory.

选项

答案 have gone

解析本题考查情态动词+动词完成式。must have done表示对过去的事情倾向于肯定的猜测，常译为“一定，准是，肯定”。如：He must have arrived by air．(他一定是乘飞机来的。)

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