题目

What time will the train leave?A.7:30. B.7:15 C.7:00. 答案:【答案】A【解析】【原文】M: Come on, Mary. It’s already 7. We will be late for the train.W: Take it easy, Tom. We still have 30 minutes. And it only takes 15 minutes to get there.先化简,再求值: ,其中x=-1,y=1
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