心为“君主之官”的理论基础是（）

A.心主血脉

B.心主神明

C.心在五行属火

D.心开窍于舌

E.心在志为喜

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