would/could//should/must have done
Q1:-Do you know where Lucy is?I couldn't find her anywhere.
-Well.She___have gone far--her handbag is still here.
A:a.mustn't b.shouldn't c.wouldn't d.can't
Q2:-Joe is never late foe school.Why is he absent today?
-Something unusual___to him.
A:a.must happenb.must have happened c.could have happened