By 2000,coal had become the fuel for more than 75% of electr

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/05/16 15:30:34

By 2000,coal had become the fuel for more than 75% of electricity produced and only hydro continued to be another significant source suppling approximately 20%.
这句话中的supply为什么要改成supplying?这句话是过去时阿
是不是如果我不用 significant source supplying approximately 20%这个句型的话我就要把这句话改成significant source which supplied approximately 20%?

如果你要改成后面的那句的话,当把which去掉的话,supplied就应该变成suppling.就和原文中是一样的了.
这是一个固定的语法,举例说明：如果是.which is regarded as.,当句中同时有关系代词和be动词时,将二者同时去掉,动词regarded保持不变.而当句中无be动词时,就像你的这句话,则要把该动词变成-ing形式.不过如果是完成时的话,就不能改,which就不能省略,这里涉及到句子时态语境的问题.
希望对你有所帮助哦.
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