______ both sides accept the agreement will a lasting peace be established in this region.

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问题 ______ both sides accept the agreement will a lasting peace be established in this region.

选项 A、Unless
B、As long as
C、If only
D、Only if

答案D

解析 只有在Only修饰状语置于句首时,句子才用倒装,主句中的助动词will才能提前。故答案选D。
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