______both sides accept the agreement______a lasting peace be established in this region.

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问题 ______both sides accept the agreement______a lasting peace be established in this region.

选项 A、Only if...will
B、If only...would
C、Should...will
D、Unless...would

答案A

解析 Only if表示“只有当……时才”,一般用于其所引导的从句的句首,且主句要部分倒装。本题的从句为一般现在时,根据句意,主句应用一般将来时态。从句意和结构上分析,A项最合适。
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