摘要:第一节 单项填空(共15小题,每小题1分.满分15分) 从A.B.C.D四个选项中.选出可以填人空白处的最佳选项.21. Long ago, man used to with his hands but now man is used to with machines, and sometimes a robot is used to instead of people. A. work, working, work B. work, working, working C. working, work, working D. working, work, work

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