问题
选择题
| Please put one teaspoon of salt into the water, then ______. |
A. mix up it B. mix it up C. mix up them D. mix them up |
答案
答案：B
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| Please put one teaspoon of salt into the water, then ______. |
A. mix up it B. mix it up C. mix up them D. mix them up |
答案：B