Has Jack finished his homework yet?

I've no idea, But he _____ it the whole afternoon. [ ]

A. would do

B. was doing

C. did

D. had done

面部皮肤清洁可以促进皮肤的新陈代谢，（）皮肤的吸收功能。

A、增强

B、减少

C、代替

D、扰乱