她可能已经被杀了。

She ___could ___have been killed.

我们还是去海边吧——等我们到那里的时候，雨可能已经停了。

Let's go to the coast anyway - the rain ___could ___have stopped by the time we get there.

他们试图建立一个关于尸体可能发生了什么事情的理论。

They tried to develop a theory about what ___could ___have happened with the dead body.

他不可能损坏了你的自行车——他整个晚上都和我在一起。

He ___couldn't ___have damaged your bike - he was with me all evening.

那本书上周不可能在售——它今天才出版！

That book ___couldn't ___have been on sale last week - it only came out today!

我们吓得血液都凝固了，都确信那除了鬼魂不可能是别的东西。

The blood froze in our veins, and we were all sure that it ___couldn't ___have been anything but a ghost!