2017国考行测真题解析:问一道英语题目,及其语法
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请教此题的答案及其所涉及的语法知识
______(see) someone who refused to back down,they turned and ran away.
______(see) someone who refused to back down,they turned and ran away.
Having seen, 分词作状语
Having seen ------- 现在分词完成式作原因状语
Having seen完成式作状语