单选题 A feeling of tiredness almost ______ the soldier on duty and he had to struggle hard to keep awake.
A. overcame B. defeated C. conquered D. overtook

【正确答案】 A

【答案解析】[解析] A选项：overcame的意思为“被(烟、感情等)熏/压倒”，如：They were overcome with sadness．(他们悲痛欲绝。)句意：这个值班的守卫几乎要被疲惫感击倒了，他不得不努力保持清醒。故选A。
其他三项意思分别是：defeated击败，使困惑；conquered攻克，破除；overtook超过，突然遭遇。