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?

admin2010-01-15  19
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作to be的表语，同时what在表语从句中又为is的表语成分，这类语法结构还有，如：Show what you have written．(把你所写的给我们看看)和She is not what she was a few years ago．(她可不是几年前的她了)。其他选项均不能表示这种语法关系。
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