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

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

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答案 have gone

解析 must have done是对过去的事情最为肯定的推测，译为“一定，肯定”。又如：She was absent fromclass．There must have been something wrong with her．(她旷课了。她一定发生了什么事。)

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Jackmust(go)______away—wecan’tfindhimanywhereinthefactory.havegonemust