问题
选择题
—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．since
D．after
答案
答案：C
It is 时间段+since +句子（句子用过去）
“--酒驾应该受到惩罚。--自从在全国开始实施已经几个月了。”
Come to effect 生效