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— __________ when has the country been open to international trade?
— 1978, I suppose.
A.SinceB.In
C.FromD.After
A

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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