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

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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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