【題目】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：新政策允許一對(duì)夫婦可再生一個(gè)孩子，條件是雙方有一個(gè)是獨(dú)生子。If only但愿；on condition that條件是；unless除非，如果不；until直到。故選B。

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