Question

【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

Answer 1

【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。