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 >>
(E) genuine manic-depressive psychosis and mood swings, which may be violent without being grounded in mental disease
the modifier of mood swings in B and D (perhaps violent) is awkward and less clear than the more developed clause which may be violent. perhaps與may be的問題好像在之前都沒解決,難道真的就是ETS不喜歡perhaps就都不用嗎?? 有沒有其他的解釋呢? | 
