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    精英家教网 > 高中英语 > 题目详情
    The new policy allows a couple to have a second birth _____either is an only child.
    A．thoughB．ifC．unlessD．until
    B

    试题分析：句意：新政策允许一对夫妇生二胎，如果其中有一人是独生子女的话。这里用if引导条件状语从句，A. though虽然，引导让步状语从句， C. unless除非，如果不，引导条件状语从句，until直到，引导时间状语从句，所以选B。
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