On April 29, 1975, the National Liberation Front forces took ______ and soon the two parts of Vietnam became a unified country.
A、Korea
B、Saigon
C、Hongkong
D、Macao
【正确答案】：B
【题目解析】：On April 29, 1975, the National Liberation Front forces took Saigon and soon the two parts of Vietnam became a unified country.参见教材P222。
