WHO WROTE THE REPORT ON THE AIR POLLUTION

15. - BAI TAP TIENG ANH CHUYEN DE CAU BI DONG CO DAP AN 15. - BAI TAP TIENG ANH CHUYEN DE CAU BI DONG CO DAP AN
BAI TAP TIENG ANH CHUYEN DE CAU BI DONG CO DAP AN
15. Who wrote the report on the air pollution? A. By whom was the report on the air pollution written? B. Whom was the report written on the air pollution by? C. By whom was the report written on the air pollution? D. All are correct.