Long ago, man used to ________with his hands but now man is used to ________with machines, and sometimes a Robert is used to ________instead of people. A.work, working, workB.work, working, workingC.working, work, workingD.working, work, work
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A解析“be used to ”接动词原形，意思为“被用来干什么”；接动名词，意思为“习惯做某事”；“used to”意思为“曾经做过某事，现在不做了”，后接动词原形。