Question

【题目】China began to open to the outside world in the late 1970s. _________, there have been great changes in the country.
A.By then
B.As a result
C.At last
D.In all

Answer 1

【答案】B
【解析】句意：中国在上世纪70年代末开始对外开放。因此国家已有了很大的变化。By then到那时；As a result结果， 因此；At last最后，终于；In all总的来说，总之，一共。所以选B。