The employee must have been dismissed by the employer last month, _______ he?

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Can; must have Must; must have Can; must Must; must

must have must have been should have should have been

It must be that It must have been He must be This must have been

may have been; can’t have been must have been; mustn’t have been may have been; must have been must have been; mustn’t be

Must; must Can; must Must; must have Can; must have

to be have been be to being

must be must have been should have been could have been

Must; must Can; must Must; must have Can; must have

must be can be must have been should have been

of proving of proved of to prove of being proved

It must be that It must have been He must be it That must have been it

It must he that It must have been He must be it That must have been it

must be caught can have been caught should have been caught must have been caught

should have done; may be could have done; must have been could have done; may have been must have done; might have been

must be must have been should have been could have been

It must be that It must have been He must be This must have been

It must be that It must have been He must be This must have been

of proving of proves of to prove of being proved

can be; mustn't be 　　　　　 may have been;must have been 　　 may have been; can't be 　　　 must have been ; can't have been