( )both sides accept the agreement ( ) a lasting peace be established in this regionA on;y if ,will B Only if would C unless,would选哪个为什么?另外这句主句是谁从句是谁?

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( )both sides accept the agreement ( ) a lasting peace be established in this regionA on;y if ,will B Only if would C unless,would选哪个为什么?另外这句主句是谁从句是谁?

( )both sides accept the agreement ( ) a lasting peace be established in this regionA on;y if ,will B Only if would C unless,would选哪个为什么?另外这句主句是谁从句是谁?
( )both sides accept the agreement ( ) a lasting peace be established in this region
A on;y if ,will B Only if would C unless,would选哪个为什么?另外这句主句是谁从句是谁?

( )both sides accept the agreement ( ) a lasting peace be established in this regionA on;y if ,will B Only if would C unless,would选哪个为什么?另外这句主句是谁从句是谁?
答案是:A
翻译:只有双方都同意这个协议,此区域才能实现长久的和平.
语法:
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. 只有患者情况紧急时,你才可以在半夜叫医生看病.
注释:此题主要是A和B的区别.选B的话,应该是和if only搞混了,if only后面+虚拟语气,而if only主要用于陈述句中.

B.
虚拟条件句,表示不太可能的事情。
主句是:( ) a lasting peace be established in this region,
从句是:( )both sides accept the agreement。

C