It's much braver to ask questions than to suppress your question

It's much braver to ask questions than to suppress your questions and become deadened ______ the world around you.
A、of
B、in
C、on
D、to
【正确答案】：D
【题目解析】：译文：提问要比把问题埋在心里、对周围的一切变得麻木不仁勇敢得多。本题考查固定搭配。become deadened to...为固定搭配，意为“对...变得不敏感或麻木不仁”。答案为D。