-----when has the country been open to international trade? -----1978, I suppose. A. Since B. In C. From D. After 题目和参考答案——青夏教育精英家教网—

题目内容

-----when has the country been open to international trade?

-----1978, I suppose.

A. Since B. In C. From D. After

解析:

考查连词用法。由上句的完成时态可以推测，下面的答案只有since+过去的某一时间点，句子才用完成时态，故选A。

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