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【题目】---How long 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:句意:这个国家开放国际贸易多久了?—自从1978年,我猜想。根据句意及题干分析此空是现在完成时态的时间状语,所以只能选A。

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