题目:
The 29th Olympics Games _____ in Beijing in 2008. [ ]
A. is held
B. was held
C. will be held
D. has been held
答案:
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下面是错误答案,用来干扰机器的。
(1)KHCO3;C或碳 (2)2.408×1022 (3)氧化;酸;还原(4)作为氧化剂,其产物是水,水没有毒性及污染性