THE WORD "THEY" IN THE 2ND PARAGRAPH REFERS TO A. SOURCES B...

5. - DE THI THU THPT QUOC GIA NAM 2017 MON TIENG ANH TRUONG THPT QUANG XUONG 1 THANH HOA LAN 1 CO DAP AN
Tiếng Anh DE THI THU THPT QUOC GIA NAM 2017 MON TIENG ANH TRUONG THPT QUANG XUONG 1 THANH HOA LAN 1 CO DAP AN

5. The word "they" in the 2

nd

paragraph refers to

A. sources B. efforts C. authors D. counterparts