---Where ______ Margaret have put the empty bottles?---She ______ them away. They must be somewhere.A.can; can’t have thrownB.must; needn’tC.must; must have thrownD.can; must throw
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A解析本题考查情态动词+have done表示对过去事实的推测的用法。must have done用于肯定句中，疑问句否定句中应用can could代替must。故选A。