change...yes,you must do it!must do!

change...yes,you must do it!must do! you must do it yourself You must do it _____this “Must we do it now?” “Yes,you ______.A.can B.must C.may you must do it by___(you) what must you do when you change lanes什么意思 you must do it.中文是什么 You must do it (careful）. Must you do not no matter how you do,you must do it You must c---- it carefully before you do it It mean''You must do this''(对'You must do this提问)