THE EIFFEL TOWER ________ DESIGN WAS REVOLUTIONARY AT ITS TIME, IS...

25. - 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

25. The Eiffel Tower ________ design was revolutionary at its time, is still a marvelous structure.

A. which

B. that

C. whose

D. of which