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.

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问题 According to many scientists, solar energy will be used ______ (extend) in the 21 st century.
选项
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)。[例句] You should listen to the teacher carefully in class．上课要认真听讲。
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