我觉得句子结构是:In presenting ..., Lansing implied that 。。。。 然后在that从句中表达对比的意思:the American government accepted the German view : however, by dropping the proposal, the Wilson administration seemed to be reverting to the British view on this question. 同时结构平行:the American government/the Wilson administration ,accepted/seemed to be reverting,the German view/the British view by dropping 。。。方式状语,主语是the Wilson administration 这题我第一次也做错了,一分析之后觉得句子结构很完美。