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