Have you met Mr Li____?A:just B:ago C:before D:a moment ago

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Have you met Mr Li____?A:just B:ago C:before D:a moment ago
意思:你以前见过李先生麽?
A:仅仅 (意思完全不对)如果说以前`应该用just now
B:虽然是"以前"的意思,表示过去,但缺没有明确的时间段,究竟是多少时间之前.
C:以前的意思,相对于D是比较模糊的时间概念词,用于完成时.
D:一会之前,但是加叻ago证明它是一个时间点,是在a moment之前的那一点,所以前面的话就卟可以用完成时叻, 要用过去方式.
所以选C

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