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【题目】—How long has the nationwide ban(禁止) on plastic bags been put into practice?
—__________ the beginning of June.
A.Behind
B.Since
C.Among
D.At

【答案】B
【解析】句意:—全国禁止使用塑料袋的禁令推行了多长时间了?—自从6月初开始。Behind在…后面;Since自从;Among在…中间;At在具体的时间点。How long是对一段时间提问的,since表示自从…开始,表示的是一段时间,故选B。

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