Something must be done to prevent factor
题型:选择题
问题:
Something must be done to prevent factories sending out poisonous gases so as to keep the city _________.
A polluting B. from polluting C. pollute D. from being polluted
Something must be done to prevent factories sending out poisonous gases so as to keep the city _________.
A polluting B. from polluting C. pollute D. from being polluted