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.Water, which seems to be so simple and common, is ______ makes life possible.

   A. that         B. which         C. what          D. where

 Water, which seems to be so simple and common, is ______ makes life possible.

     A. that           B. which         C. what              D. where

 Water, which seems to be so simple and common, is ______ makes life possible.

     A. that           B. which         C. what              D. where

.Water, which seems to be so simple and common, is ______ makes life possible.

   A. that         B. which         C. what          D. where

Water, which seems to be so simple and common, is ______ makes life possible.

A．that              B．which            C．what             D．where