they are very tired.why [don't they,not they,do they,not to] have a rest
问题描述：
they are very tired.why [don't they,not they,do they,not to] have a rest
答
they are very tired.why [don't they] have a rest?you look rather tired.___ stoppinng to have a rest?--all right A.why notB how aboutCwhy not to Dwhy don'tBhow aboutdoing sth做某事怎么样？