-How long have you been there?-____last month.A.For B.Until

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-How long have you been there?-____last month.A.For B.Until C.Before D.Since 选出结果并说明理由.
为什么B不行啊？

选D since.
since last month意思是从上个月到现在为止是一个段时间
For 引导一个段时间 last month是个点时间
Until 是到什么为止,而他现在还在那边和题意不符合
回答How long的提问要用段时间回答
再问：为什么B不行？
再答：你看一下这个单词的意思 until [,ʌn'til] conj. 在…以前；直到…时prep. 在…以前；到…为止 until last month 意思到上个月为止而题目中问的是have 而不是had 说明这个人还在哪儿如果是until last month 就应该是How long had you been there?

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