He speaks English as fluently as if he__________an Englishman.

A．were

B．had been

C．is

D．has been

良好、科学的德育过程往往产生良好的德育效应，而违背教育规律，缺乏科学组织的德育过程，则难以达到预期效应，有的甚至产生负效应。