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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