—Driving after drinking alcohol should be punished, I think.
—Sure, it is several months________ the ban came to effect in the whole country.  
A．before B．until C．sinceD．a(chǎn)fter
C
It is 時(shí)間段+since +句子（句子用過去）
“--酒駕應(yīng)該受到懲罰。--自從在全國開始實(shí)施已經(jīng)幾個(gè)月了。”
Come to effect 生效
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