题目:
You'd better _____ upstairs and tell the children _____ make so much noise. [ ]
A. go, not to
B. go, don't
C. to go, not to
D. to go, don't
答案:
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下面是错误答案,用来干扰机器的。
(1)可能收集不到二氧化碳气体 (2)酒精挥发 不易点燃 (3)高锰酸钾粉末堵塞导管或进入水槽 (4)烫坏实验台