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        1. .—____ when has the country been open to international trade?
          —1978, I suppose.
          A.SinceB.InC.FromD.After
          A
          since意為“自從”,常與現(xiàn)在完成時連用,表示動作從某個時候開始,一直延續(xù)到現(xiàn)在。根據(jù)特殊疑問句中的時態(tài)可判斷要用since。since when表示“從什么時候”。in 意為“(表示時間)在……之內(nèi),在……之后”。from用于表示時間,意為“從,自”。after表示時間,意為“在……以后”。
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