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求解答——How long do you suppose it is___ he arrived here?——No m

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求解答——How long do you suppose it is___ he arrived here?——No more than half a week
A since B before C after D when
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求解答——How long do you suppose it is___ he arrived here?——No m
A
How long do you suppose it is __since___ he arrived here?
.他来了多久?不到半年
后面一句里有half a year,表示一段时间,所以选A ,如果选B的话要改成a month ago,因为是一个时间点
再问： 也就是说since用时间段，before用时间点？
再答： 嗯，如果改成a month ago可用before
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