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【题目】The new policy allows a couple to have a second birth____either is an only child.

A. if only B. on condition that

C. unless D. until

【答案】B

【解析】句意:新政策允许一对夫妇可再生一个孩子,条件是双方有一个是独生子。If only但愿;on condition that条件是;unless除非,如果不;until直到。故选B。

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