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

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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 D

解析表示否定意义的词位于句首时，其后用倒装结构。实义动词的倒装要用助动词帮助其构成倒装；此题中时态为过去时，所以用助动词did构成倒装。因此D为答案。

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______both sides accept the agreement ______ a lasting peace be established in t