如果某物质在氧气中燃烧,生成二氧化碳和水,那么该物质是由什么元素组成的? 发布时间:2017-07-06 16:17 │ 来源:www.tikuol.com 题型:问答题 问题: 如果某物质在氧气中燃烧,生成二氧化碳和水,那么该物质是由什么元素组成的?
题型:问答题 The weather turned out to be fine yesterday.I_______the trouble to carry my umbrella with me. A.should have takenB.could have takenC.needn't have takenD.mustn't have taken 查看答案