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【題目】---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】

試題分析:句意:這個國家開放國際貿易多久了?—自從1978年,我猜想。根據句意及題干分析此空是現在完成時態(tài)的時間狀語,所以只能選A。

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