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I hear our teacher will be back           three weeks' time.

     A. at           B. in                  C. for                D. after

B

【解析】选B。考查介词用法。at 一般加时间点;in +一段时间表示将来时;for加一段时间,通常用于完成时;after通常用于引导过去时的从句。由will提示,应该选B。

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