求教一道语法题

xiangfei93

2.In his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis.

(A) mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis

(B) mood swings, perhaps violent without being grounded in mental disease, and genuine manic-depressive psychosis,

(C) between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis

(D) between mood swings, perhaps violent without being grounded in mental disease, from genuine manic-depressive psychosis（C）

(E) genuine manic-depressive psychosis and mood swings, which may be violent without being grounded in mental disease

cynthia1991

首先要搞清楚是用distinguish between A and B 还是distinguish  A from B。显然这里应该用前者，因为mood swings和genuine manic 是对立的两个东西，而A from B 中A是B的子集。再者between不能省略，所以直接排除ABDE