官渡之战中曹操取胜的主观原因是[ ]

A．采取正确的计策

B．军事力量强大

C．取得了民心

D．袁绍刚愎自用

That hero who died in the war was so brave that he never ____ to the enemies until death. [ ]

A. gave up

B. gave out

C. gave in

D. gave away