在此before是副词.如在句末,谓语通常用现在完成时.如：I haven't seen the film before.
I have seen him before.
I have read that book before BEFORE可以用在现在完成时肯定句吗
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相关问题
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I( )the book twice before:A.read B.have readed C.have read D
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_____ seemed that he _____ read the book before. [
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现在完成时能不能跟before?例如：Have you been there before?一般现在完成时后要跟什么时间
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before在做什么解释时 用在现在完成时中