- when has the country been open to international trade? - 1978, I suppose. A. Since B. In C. From D. After 题目和参考答案——青夏教育精英家教网——

题目内容

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

— 1978, I suppose.

A. Since B. In

C. From D. After

A

解析:

A。根据句中的现在完成时态可知，此题填since最佳。Since when的意思是“从什么时候开始”，又如：Since when have you lived here?你从什么时候起住在这里的?

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