大学英语四级语法精要:非谓语动词的完成进行式
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大学英语四级语法精要:非谓语动词的完成进行式
非谓语动词的完成进行式: 在谓语所表示的时间之前一直进行的动作, 就要用不定式的完成进行式.The struggle was known to have been going for twenty years.
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