MUCH LEARNED ABOUT OUR UNIVERSE SINCE THE TIME OF COPENICUS AND GA...

22. - TRAC NGHIEM TIENG ANH 12 PROGRESS TEST 2
TRAC NGHIEM TIENG ANH 12 PROGRESS TEST 2

22.

Much

learned about our universe since the time of Copenicus and Galileo, but most of the

discoveries

made during this centuries.

A.has been/ have been

B.is/ are

C.have been/ has been

D.was/ were