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

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

B

【解析】選B�？疾榻樵~用法。at 一般加時間點；in +一段時間表示將來時；for加一段時間，通常用于完成時；after通常用于引導(dǎo)過去時的從句。由will提示，應(yīng)該選B。

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