一道填空求助！

Excessive focus on what might have been can cause in us feelings of restlessness and regret,but some scientists are beginning to think that fancying an alternative reality might have ______effects as well.
　　A：subtle
　　B：adverse
　　C：restorative
　　D： pleasurable
　　E：unfavorable
　　F：tonic

上辅导班的时候老师说答案是BE 解题点是as well，老师言之凿凿的说答案错了？

但我查了查网上的解答都说是CF 求高手解答！{:4_112:}