the population is too large, we have to take measures to control the birth rate.

游客2024-07-21 23

问题 the population is too large, we have to take measures to control the birth rate.

选项 A、Although
B、Since
C、If
D、Until

答案 B

解析 since引导的是原因状语从句，表示“因为，由于”。其他选项与题意不符：although意为“虽然，尽管”，if意为“如果”，until意为“直到……才”，故选B。

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