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---______when has the country been open to international trade?
---1978,I suppose.


  1. A.
    Since
  2. B.
    In
  3. C.
    From
  4. D.
    After
A
since意为“自从”,常与现在完成时连用,表示动作从某个时候开始,一直延续到现在。根据特殊疑问句中的时态可判断要用since。since when表示“从什么时候”。in 意为“(表示时间)在……之内,在……之后”。from用于表示时间,意为“从,自”。after表示时间,意为“在……以后”。
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