2. 外语
  3. What will continue to be ______ it is today--next in importance to oxygen?

What will continue to be ______ it is today--next in importance to oxygen?

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问题 What will continue to be ______ it is today--next in importance to oxygen?
选项 A、how
B、which
C、what
D、as
答案C
解析 关系代词what在这里引导一个名词性从句做to be的表语，同时what在表语从句中又为is的表语成分。其他选项均不能表示这种语法关系。
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