He has been away _____.[ ] A.since a month B.for a month C.f

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He has been away _____.[ ] A.since a month B.for a month C.for a month ago D.in a month

B. for a month
和现在完成时连用, 表示has been away 持续多久
A. since a month 如果后面加ago 也对
C. for a month ago 没这个说法
D “在一个月以后（以内）”与语境不符
如不明白请追问,如果满意请【采纳】
祝学习进步
再问： AB再详细
再答： since a month ago 指的是从一个月前算起至现在，这样的时间状语一般和现在完成时连用，但A 缺少ago

由于 has been away 是一个状态，这种状态可以持续，所以可以和for(长达）引出的时间状语连用
再问：看不明白。白了，我还是问真人的比较好
再答：晕，好像我这个人是虚拟的。：）

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