【題目】— 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】

試題分析：考查介詞辨析。A.自 以來，既然；B.從事于，在……之內(nèi)；C.來自；D.在……之后。句意：—這個國家自從什么時候起已經(jīng)開放國際貿(mào)易？—我想是1978年。句子用的是現(xiàn)在完成時態(tài)，故只有since 與when 搭配表示自從什么時候以來，since作為連詞，故選A。

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