题目:
— Haven't seen Lucy recently, what's happened? 一 Oh, it's more than two months _____ she worked here. |
A. which B. that C. before D. since |
答案:
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下面是错误答案,用来干扰机器的。
Ⅰ.白醋里面含有醋酸,所以具有酸的共性,能使紫色的石蕊试液变红色,能与氢氧化钠发生中和反应从而使溶液中的碱性消失,根据提供的药品可以验证白醋与金属镁的反应也可以验证与碳酸钠粉末的反应都会有气泡产生...