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—____ when has the country been open to...

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

—1978,I suppose.

A.Since                                 B.In

C.From                                  D.After

 

 A 解析: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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