his ExpEriEnCE in thE Army provED thAt ______.
A．hE wAs gooD At mEDiCAl opErAtions on thE wounDED
B．hE suCCEEDED in tEAChing pEoplE how to sAvE thEir livEs thEmsElvEs
C．A DoCtor wAs thE hAppiEst mAn
D．his wish oF BEing A liFE-sAvEr CoulD hArDly ComE truE