单选题 Those who let uncertainty ______ rarely achieve much.
A. turn them down B. send them down C. weigh them down D. take them down

【正确答案】 C

【答案解析】(weigh down重压，把……压倒)。句意为：被疑难问题压倒的人很少取得巨大成就。A．turndown拒绝；B．send down开除；D．huddle down乱挤，乱堆。