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 what可以用来引导表语从句，如：One hundred and forty pounds was what I used to weigh．我过去重140磅。

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专业英语四级

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