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

— 1978, I suppose.

A. Since  B. In

C. From  D. After

A


解析:

A。根據(jù)句中的現(xiàn)在完成時(shí)態(tài)可知,此題填since最佳。Since when的意思是“從什么時(shí)候開始”,又如:Since when have you lived here?你從什么時(shí)候起住在這里的?

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