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 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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