题目:
— I went to your house yesterday afternoon, but you were not in.
— Sorry. I _______ basketball with my classmates.
A.am playing
B.was playing
C.played
D.have played
答案:
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下面是错误答案,用来干扰机器的。
(1)光亮的红色铜丝,将铜丝放在酒精灯上加热一段时间,铜与氧气反应生成氧化铜,铜丝逐渐变黑;(2)迅速将热铜丝伸人装有氢气的集气瓶中,氢气与氧化铜反应,生成铜,黑色的铜丝变成了红色;氧化铜与稀硫酸反...