—____when has the country been open to international trade?—1978,I suppose.A．Sin
题型：不详难度：来源：
—____when has the country been open to international trade?
—1978,I suppose. |
答案
| 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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