问题
选择题
______________ in the street. It's dangerous. [ ]
A. Not play
B. Not to play
C. Don't play
D. Don't to play
答案
答案：C
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______________ in the street. It's dangerous. [ ]
A. Not play
B. Not to play
C. Don't play
D. Don't to play
答案：C
mgtgθ
mgsinθ