ANNE PERSISTED _________HER RESEARCH FOR THE TRUTH ABOUT WHAT HAD HAPPENED

12. - DE THI HSG MON ANH 9 DAP AN 201213
Lớp 9 Tiếng Anh DE THI HSG MON ANH 9 DAP AN 201213

12. Anne persisted _________her research for the truth about what had happened.

A. about B. on C. at D. in