问题
选择题
Water is a liquid which has no color _______ you wash your hands in it, then it turns black.[ ]
A. before
B. until
C. since
D. because
答案
答案：B
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Water is a liquid which has no color _______ you wash your hands in it, then it turns black.[ ]
A. before
B. until
C. since
D. because
答案：B