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In a flash he bought the stamp,attached it to the envelope a

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In a flash he bought the stamp,attached it to the envelope and threw it into tje mailbox.
逗号后面为什么用attached,不用attaching?
In a flash he bought the stamp,attached it to the envelope a
Attach这里不是非谓语动词,这里它是谓语动词,是一般过去时 与bought是并列的 ,他买了张邮票,把它粘在信封上,然后扔进了邮箱