单选题 She omitted to mention that they were staying the night.
【正确答案】 A
【答案解析】[解析] 本句意思：她没说他们当晚要留宿的事。omit不做，未能做。fail未做，未履行；forget忘记，遗忘；delete删除；leave out遗漏，省略，未顾及。