AS SOON AS THE FIRE - BELL RANG EVERYONE WALKED QUICKLY DOWNSTAIRS...

7. - BỘ ĐỀ THI HOC SINH GIỎI T ANH 9
Tiếng Anh BỘ ĐỀ THI HOC SINH GIỎI T ANH 9

7. As soon as the fire - bell rang everyone walked quickly downstairs and out of the building, .... gathered in the car park.

A. while

B. then C. before

D. to