要求还真不低.选C.介词短语做目的状语.主语all exits,系词must be,表语kept,主语补足语clear,时态一般现在时.句意:为了预防火灾,所有出口必须保持畅通.A、B替代、顶替,D尽管,均不合题意.
( )fire,all exits must be kept clear.A.In place of B.Instead
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