题目
pleace they must have finished their work by now.为什么用have finished?
they finally succeeded in carrying out the experiment.
they must have finished their work by now.为什么用have finished?
i have been looking forward to hearing from you.为什么用have been?
it has not been decided yet when the meeting will start at the hall.为什么用been,不要be?
i won't visit that restaurant today.won't 在什么时候用?
they finally succeeded in carrying out the experiment.
they must have finished their work by now.为什么用have finished?
i have been looking forward to hearing from you.为什么用have been?
it has not been decided yet when the meeting will start at the hall.为什么用been,不要be?
i won't visit that restaurant today.won't 在什么时候用?
提问时间：2020-07-31
答案
1.通过后面的 BY NOW 我们可以了解到 主人翁肯定已经做过这件事 所以用MUST HAVE DONE 来说明非常确定 .翻译：他们现在肯定已经完成他们的工作了.2.他们最终成功地完成了那项实验.3.现在完成时 有一条 叫做 如果句子...
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