单选题 Living constantly in the atmosphere of slave, he became infected ______ the unconscious ______ their psychology. No one can shield himself ______ such an influence.
A. on...by...at B. by... for...in
C. from...in...on D. through...with...from

【正确答案】 D
【答案解析】[解析] “通过……感染”，infected后只能用介词through；“使某人摆脱……”，shield后只能跟from；所以选D。