问题
选择题
—Don't throw paper on the ground, please. — ______. [ ]
A. It doesn't matter
B. I'm sorry
C. Excuse me
D. That's all right
答案
答案：B
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—Don't throw paper on the ground, please. — ______. [ ]
A. It doesn't matter
B. I'm sorry
C. Excuse me
D. That's all right
答案：B