中文谷Chinabegantoopentotheoutsideworldinthelate1970s．
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问题详情：
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
【回答】
B
知识点：介词和介词短语
题型：选择题
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