be,must be,can't have been,must have been吗
be,must be,can't have been,must have been吗
选词填空(can't have been\must be\must have been\can't be \may ha
must have been done/must be done
A.must be B.may have been C.can have been D.could be ,为什么呢,
can't have been和must have been
must be和must have been有什么区别
HELP!A might have been B might be C must be D can be
He can't have been.He must have been.不是说单三用has吗?
在英语里coms been、must been和may been和come have been、must have be
can be done was done could be done must have been done will
There must have been several hundreds people present just be
He must have been caught in the rain,as can be seen from his