WINDMILLS _________ BY THE PERSIANS AROUND 1500 YEARS AGO. A. ARE...

21. - 25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN
25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN

21.

Windmills _________ by the Persians around 1500 years ago.

A. are invent

B. are invented

C. were invented

D. invented