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_______both sides accept the agreement _...

_______both sides accept the agreement __________ a lasting peace be established in this region.

A.Only if; will B.If only; would

C.Should; will D.Unless; would

 

A 【解析】 考查条件状语从句和倒装。句意:只有双方都同意这个协议,此地区才能实现长久的和平。only if 引起的条件状语从句,是一个对“条件”限制更严的“限制性条件状语从句”,表示“只有……(才);只有在……的时候;唯一的条件是……”的意思;与if引起的一般条件句相比,它有一种增强主句语势的作用。例如:Only if the case is urgent should you call out the doctor in the middle of the night. 只有情况紧急时,你才可以在半夜叫医生看病。only if引导条件状语从句时,放在主句前面时主句要部分倒装。综上,选A。
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