pleace they must have finished their work by now.為什么用have finished?
pleace they must have finished their work by now.為什么用have finished?
they finally succeeded in carrying out the experiment.
they must have finished their work by now.為什么用have finished?
i have been looking forward to hearing from you.為什么用have been?
it has not been decided yet when the meeting will start at the hall.為什么用been,不要be?
i won't visit that restaurant today.won't 在什么時(shí)候用?
they finally succeeded in carrying out the experiment.
they must have finished their work by now.為什么用have finished?
i have been looking forward to hearing from you.為什么用have been?
it has not been decided yet when the meeting will start at the hall.為什么用been,不要be?
i won't visit that restaurant today.won't 在什么時(shí)候用?
英語人氣：267 ℃時(shí)間：2019-09-09 18:17:00
優(yōu)質(zhì)解答
1.通過后面的 BY NOW 我們可以了解到 主人翁肯定已經(jīng)做過這件事 所以用MUST HAVE DONE 來說明非常確定 .翻譯：他們現(xiàn)在肯定已經(jīng)完成他們的工作了.2.他們最終成功地完成了那項(xiàng)實(shí)驗(yàn).3.現(xiàn)在完成時(shí) 有一條 叫做 如果句子...
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