We began to open to the outside world in the ate 1970s. , there have been great changes in the country.
A. As a result of
B. As a result
C. First of a11
D. After all
网友回答
A. As a result of
(答案→)B. As a result
C. First of a11
D. After all
解析：考查固定词组，D．After all毕竟C．First of a11首先A．As a result of…的结果B．As a result结果，句子意思“在上世纪70年代我们开始对我开放，结果在我们国家有很大的变化”