must not have been;could not have
must not have been;could not have
could not have done
must not have
have not been to
They must have been to the USA,have not they?与He must have b
can not have visited could have visited must have visited sh
could not have done是什么意思?
may not have been...与 may have not been ...
i have been not well
选用can(not),must(not),should(not),have to,may
英语翻译I could not have been more surprised if he had said the
I should have been there,but I could not find the time