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 本题中选项D)作连接代词,在句中作表语。本句大意为“水将依然处于今天所占的地位一一其重要性仅次于氧”,所以答案为D)。
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