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— __________ when has the country been open to international trade?

— 1978, I suppose.

A. Since  B. In

C. From  D. After

A


解析:

A。根据句中的现在完成时态可知,此题填since最佳。Since when的意思是“从什么时候开始”,又如:Since when have you lived here?你从什么时候起住在这里的?

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