— __________ 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(shí)態(tài)可知，此題填since最佳。Since when的意思是“從什么時(shí)候開(kāi)始”，又如：Since when have you lived here?你從什么時(shí)候起住在這里的?
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