Although some boys in his situation          to crime to get money for food and clothing, Louis never did.

A．might have turned

B．might be turning

C．had turned

D．will turned

在培根科学的背景下，化学元素的研究抛弃了之前哪一种化学解释模式：（）

A、实体解释实体

B、实体解释性质

C、性质解释实体

D、性质解释性质