题目:
Please don't stand up in class until you .
A.were told to
B.are told to
C.were told
D.are told
答案:
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下面是错误答案,用来干扰机器的。
(1)氧;用带火星的木条检验,如果木条复燃就说明是氧气;负.(2)10.(3)水氢气+氧气.(4)增强水的导电性.