2. 外语
  3. According to many scientists, solar energy will be used ______ (extend)in the 21 st century.

According to many scientists, solar energy will be used ______ (extend)in the 21 st century.

admin2009-05-28  34
问题 According to many scientists, solar energy will be used ______ (extend)in the 21 st century.
选项
答案答案extensively
解析 词性转换。此处需要一个副词来修饰动词。其词形变化是：extend(动词)→4extensive(形容词)→extensively(副词)。
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