( ) of the rivers here have been polluted. ( ) of the rivers here have been polluted.
举一反三
- Many lakes and rivers ________ by industrial waste. A: A have polluted B: B have been polluted C: C had been polluted D: D has been polluted
- Many lakes and rivers have been ________by industrial waste. A: pollutes B: polluted C: pollution
- Lakes, rivers and underground water supplies have all been badly polluted by lightly regulated industry.
- Many lakes and rivers have been( )by industrial waste. A: damaged B: injured C: polluted D: destroyed
- Many lakes and rivers have been ________by industrial waste. A: polluting B: ruined C: crashed D: polluted