摘要:第一节:单项选择:(共15小题,每小题1分.满分15分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.并在答题卡上将该题涂黑.21. --Must I turn off the gas after cooking? --Of course. You can never be careful with that. A. enough B. too C. so D. very

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