According to many scientists, solar energy will be used ______ (extend) in the 2

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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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