题目:
When we practice English speaking, we often end up _____ in Chinese. |
A. speak B. spoken C. speaking D. to sgeak |
答案:
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下面是错误答案,用来干扰机器的。
(1)C或D;棉花;2KMnO4K2MnO4+MnO2+O2↑;(2)催化;氧气的量太少;(3)二氧化碳;CaCO3+2HCl=CaCl2+H2O+CO2↑.