单选题 Her spirits ______ at the thought of all the work she had to do that morning.

【正确答案】 A

【答案解析】sag向下凹或中间下陷；松弛或不整齐地悬着；sack解雇某人；saddle sb． with sth．让某人承担使人厌恶的责任或任务等；score得分。