问题
选择题
— How long has the nationwide ban (禁止) on plastic bags been put into practice?
— the beginning of June. [ ]
A. Behind
B. Since
C. For
D. At
答案
答案：B
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— How long has the nationwide ban (禁止) on plastic bags been put into practice?
— the beginning of June. [ ]
A. Behind
B. Since
C. For
D. At
答案：B