I asked him how long he________the bike which I________for just ten days．A.had borrowed，had boughtB.had kept，had hadC.had borrowed，had hadD.had kept，had borrowed
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B解析分析：从how long和for just ten days可以知道，必须用延续性动词。borrow和buy是短暂性动词，与borrow和buy相对应的状态性动词分别是keep和have，因此选B．