问题
选择题
4. First put some salt on the water and then _____.[ ]
A. Mix them up
B. Mix up them
C. Mix it up
D. Mix up it
答案
答案：C
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4. First put some salt on the water and then _____.[ ]
A. Mix them up
B. Mix up them
C. Mix it up
D. Mix up it
答案：C