The new policy allows a couple to have a second birth _____either is an only child.
A．thoughB．ifC．unlessD．until
B

試題分析：句意：新政策允許一對夫婦生二胎，如果其中有一人是獨生子女的話。這里用if引導條件狀語從句，A. though雖然，引導讓步狀語從句， C. unless除非，如果不，引導條件狀語從句，until直到，引導時間狀語從句，所以選B。
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