my mother has been woking in that clothing factory for-

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my mother has been woking in that clothing factory for-
A.one and a half year B.one year and a half C.a year and ahalf year 2；he has been collecting stamps____five years ago A.since B.for C.in

1. B 因为A不对,应该是one and a half years, C太罗嗦,没有那个说法
2. A 因为有个句末ago,所以B C排除
再问： 1；是固定用法么？ 2；我不懂，请说的再详细点
再答：那个1吧，我们老师说了，只要是超过1，哪怕1.5，也要用复数形式，所以是years，所以A排除。B确实有那个固定说法，死记着就行。C一定不对的，没那个说法。 2，句末有个ago，所以不能用for和in，因为for和in直接接年份就行， for 5 years是长达五年的意思，in 5 years是在五年之内。排除这俩就选A， since 5 years ago就是从五年前开始。

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