有个句子 是His grandfather have dead for foue years.还是His grandfather dead for foue years. 若是第一个,为什么,不是现在完成时要用持续的动词么? 还有句子 How long have you ____the bike? A.bought B.had C.borrowed 答案好像是B,为什么不能选AC呢? 问一下,是不是现在完成进行时必须have / has + been +(一个可延续动词)
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