(A) IT WAS (B) NOT UNTIL 1937 THAT THE SOUTHERN (C) SOURCE OF THE...

30. - BAI TAP TRAC NGHIEM TIENG ANH 12
BAI TAP TRAC NGHIEM TIENG ANH 12
30. (A) It was (B) not until 1937 that the southern (C) source of the Nile River (D) is discovered.III. Choose the one option (A, B, C or D) corresponding to the best sentence