He has lost the key to the drawer ____ the papers are kept.He has lost the key to the drawer ____ the papers are kept.A. whereB. in whichC. under whichD. whichthe key is Bwhy not A
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这是一个定语从句，引导词要看从句，主动语态中，我们的表达方式是：We keep the papers in the drawer，改成被动语态后，介词in是不能省略的