2. 外语
  3. ______ both sides accept the agreement ______ a lasting peace be established in this region.

______ 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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