这个题目选A since
翻译：--全国禁塑令什么时候实施的?
--（自）从六月初开始的.
因为：since指从.时候起
如：since 1999 自从1999年开始
【俊狼猎英】 不懂欢迎追问
when was the nationwide ban on plastic bags put into practic
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