2. 外语
  3. Water will continue to be______it is today, next in importance to oxygen.

Water will continue to be______it is today, next in importance to oxygen.

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问题 Water will continue to be______it is today, next in importance to oxygen.
选项 A、how
B、which
C、as
D、what
答案D
解析 本题为单词用法题。what引导从句，作be动词的表语，what在从句中又作is的表语。how引起方式状语；which引导状语从句；as引导定语从句。所以答案为D)。
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