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    【题目】— when has the country been open to international trade? —1978，I suppose.

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

    【答案】A

    【解析】

    试题分析：考查介词辨析。A.自 以来，既然；B.从事于，在……之内；C.来自；D.在……之后。句意：—这个国家自从什么时候起已经开放国际贸易？—我想是1978年。句子用的是现在完成时态，故只有since 与when 搭配表示自从什么时候以来，since作为连词，故选A。

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