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

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