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__________(在1世纪末就开始投入使用), this kind of energy had brought great convenience for
__________(在1世纪末就开始投入使用), this kind of energy had brought great convenience for
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2024-02-23
6
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问题
__________(在1世纪末就开始投入使用), this kind of energy had brought great convenience for human beings.
选项
答案
Having come into use at the end of 18th century
解析
考查分词作状语从句的表达。看整句时态,完全是描述过去的事情,所以要用分词的完成式having done的形式。“投人使用”译为come into use。
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