______ both sides accept the agreement ______ a lasting peace be established in

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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作“只要,只有”讲,相当于on condition that。当其置于句首时,主句要用倒装结构,例如: Only if a teacher has given permission,is a student allowed to enter this classroom.只有得到老师的允许,学生才可以进这间教室。Only if the red light comes on,is there any danger to workers.只要红灯一亮,就表示有危及工人的险情。if only用来表
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