MANY REPORTS IN NEWSPAPERS TALKED ABOUT THE ___OF UFOS. A. APPEA...

15. - DE THI HK 2 CO DAP AN TIENG ANH 9 DE THI HOC KY 2 CO DAP AN
DE THI HK 2 CO DAP AN TIENG ANH 9 DE THI HOC KY 2 CO DAP AN

15. Many reports in newspapers talked about the ___of UFOs.

A. appear B. appearance C. appeared D. appearing