摘要:第一节 单项填空(共30小题,每小题1分.满分30分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳答案.21.– What is that noise? – Oh, I forgot to tell you. The new machine . A.was tested B.will be tested C.is being tested D.has been tested

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