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They are said______each other long time before they met in Harvard University where they worked together on a research project.
They are said______each other long time before they met in Harvard University where they worked together on a research project.
admin
2015-09-30
54
问题
They are said______each other long time before they met in Harvard University where they worked together on a research project.
选项
A、to know
B、to have known
C、knowing
D、having known
答案
B
解析
to have known不定式完成式表示过去已经发生的情况。
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