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！

我觉得重点是要知道 ‘might have been’ 是已经发生的事情，和后面的'reality' 对应。But，表示转折，所以填的词，要和'restlessness and regret'相反，自然就是正面的词。CF

CF吧  和前面的restlessness and regret 取反

个人觉得as well也是服务于but，强词应该是But，选CF没错
还有个歪招是：干扰项D是褒义，答案要取正

but as well就是翻译成"但是与此同时"

A = Excessive focus on what might have been = fancying an alternative reality
A不好，但是科学家觉得A可能也____.
虽然选项我都不认识了，但是应该填正向词。

but.. as well可以翻译成“但是也会...."明显是转折，所以是cf.