是A.这是大全的解释.
个人觉得是broke 和dispute语义重复.所以A最好.
Choice A is correct. In B, over is misused: the idiomatic form of expression is broke..in, not broke…over, and over should appear immediately before the issue in dispute( i.e., the nature of Stalinism). Choice C, wordy and imprecise, does not specify who was involved in the dispute. In D and E, dispute(d) about is less direct and idiomatic than dispute(d) over. Also, D is needlessly wordy and over is misused in E. This is a difficult question. | 
