你可能感兴趣的试题
in danger in public in silence in trouble
to throw litter about to throw litter into throwing litter about throwing litter into
must is done must be done must do must done
stop… from polluted keep…being polluted prevent… being polluted stop…from polluting
Yes, we can No, we can’t Yes, we must No, we needn’t
must is done must be done must do must done
stop; pouring . prevent; to pour keep; pouring stop; to pour
dirty better worse more better
better dirty more better worse
stop stopped to stop stopping
湘公网安备 43130202000226号