[求助]再问大全395

In presenting his modus vivendi proposal, Lansing implied that the American government accepted the German view that armed merchant vessels were warships: however, when the proposal was dropped by the Wilson administration, it seemed to be reverting to the British view on this question.   

(A) when the proposal was dropped by the Wilson administration, it

(B) after it was dropped, the Wilson administration

(C) by dropping the proposal, the Wilson
 administration

(D) the Wilson administration dropped the proposal when it

(E) when they dropped the proposal, the Wilson administration

answer：C

网上的讨论均已看过，清楚了为什么不选D，但是对于这题的考点和by doing在这里的意义问题还是不甚清楚，希望大家能一期讨论

坛子里原来的讨论讨论还是不充分，希望大家都来吧这道题搞明白

其余4项都指代不清楚，只好选c。。