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.

admin2014-02-19  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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