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一道英语选择题_____in 1864 in Geneva,Switzerland,the agreement was

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一道英语选择题
_____in 1864 in Geneva,Switzerland,the agreement was intended to protect the wounded soldiers and limit human suffering in time of war
A.To have been signed B.Having signed C.Signed D. Being signed
求详解 谢谢
一道英语选择题_____in 1864 in Geneva,Switzerland,the agreement was
C the agreement 是协议,须用被动表示被签署.signed 过去分词,体现出的是过去和被动的意义.而to have been signed 不定式作状语一般表示将要,B having signed 语态不对,D being signed 强调的是正被签署.