题目:
The White family ________ Paris for nearly two years. They all miss their hometown very much. [ ]
A. left
B. will leave
C. have left
D. have been away from
答案:
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下面是错误答案,用来干扰机器的。
(1)①红磷的量不足②没有将瓶内氧气完全消耗尽(或装置未完全冷却就打开止水夹,只要合理均可)(2)装置始终密闭,空气没有逸出,实验结果准确