It was not until 1937 when Southern source of the Nile River was discovered. A. was B. until C. the D. when
It was not until 1937 when Southern source of the Nile River was discovered.
A. was
B. until
C. the
D. when
Kiến thức: Cấu trúc câu “It was not until … that …”
Giải thích: Cấu trúc "It is/was not until..." phải nối với mệnh đề theo sau b ằng "that" không dùng "when". when => that
Tạm dịch: Mãi đến năm 1937, nguồn sông Nile ở phía Nam được phát hiện.
Đáp án: D