They have been _____ about what may have caused the fire.(theory)

问题描述:

They have been _____ about what may have caused the fire.(theory)

theory是名词,它可以作动词吗???

theorifing,现在完成进行时,表示动作一直在进行,have been done表示动作已完成且为被动,而该句中的关系明显是为主动

theoried
前面有have been 所以用完成时了 have been done