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【题目】There six countries in SCO(上合组织) at first, but now the number has increased to eight.

A. is B. are C. were D. will be

【答案】C

【解析】

句意:上合组织最初有六个国家,但现在已经增加到八个。at first最初,此处是指过去的时间,故时态为一般过去时,答案为C。

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