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pass（通过）是（及物和不及物）动词，passed是过去式，也是过去分词；past（过去，过去的，超过，超出，越过， 经过）是形容词、名词、介词、副词。如; He passed the exam. The Bill(议案） has been passed. He passed through the doorway into Room 203. I knew from past...