ALL BOTTLES _______BEFORE TRANSPORTATION. A. HAVE FROZEN B. FROZE...

20. - 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

20. All bottles _______before transportation.

A. have frozen

B. froze

C. were frozen

D. will freeze