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

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

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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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