13.The _______________ stage has been reached and we must do something to change thesituation today.
举一反三
- —Must we finish the work today? —________. We have something else to do tomorrow.
- Tim ______ not come today because his flight has been delayed. A: might B: must
- Only recently_________ to deal with the environmental problems. A: something has done B: has something done C: has something been done D: something has been done
- It has been often said that books do for us today is what university did in earlier ages.
- Only in the past few years _______ to improve the living conditions in this area. A: something has been done B: there is something done C: has there something been done D: has something been done