First of all,they may have come to this planet of ours thousands or millions of years ago
First of all,they may have come to this planet of ours thousands or millions of years ago
為什么用現(xiàn)在完成式have come to,后面不是有years ago.不用過去完成式had come to
為什么用現(xiàn)在完成式have come to,后面不是有years ago.不用過去完成式had come to
英語人氣：153 ℃時(shí)間：2020-04-05 04:23:15
優(yōu)質(zhì)解答
因?yàn)檫@是may have come 是情態(tài)動(dòng)詞的完成時(shí) 不屬于現(xiàn)在完成時(shí) 是對(duì)過去情況作出判斷的 所以 可以和過去時(shí)間連用
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