at a loss what to do 是一种什么结构？有网友问：我看到这样一个句子：I was completely at a loss what to do. 请问，这个句子中what to do 前面为什么没有介词作连接，at a loss 后面就直接接了宾语从句，而前面的部分根本没有给宾语留位置，这是怎么回事？ at a loss 是介词短语，也是英语的习惯用语，意为“感到困惑；不知所措”，之后经常跟 wh-word + to do 形式。由于表达“疑问”的概念，所以后面的从句不用 that 引导，而是用带有疑问的 wh-word 引导。at a loss 跟 wh-word 从句的情况相对较少，而跟 wh-word + to do 居多。下面是 at a loss 的用法：1. at a loss 之后跟 wh-word 从句：The police were at a loss who should be blamed for the accident. 警方不知道谁要为这起交通事故受到谴责。She was at a loss what she should do. 她不知该怎么办好。2. at a loss 之后跟 wh-word + to do：She is timid and completely at a loss what to do.她羞臊得不知所措。Mary is at a loss when to start. 玛丽不知道何时开始。He was at a loss how to cut the knot. 他不知如何才能大刀阔斧地解决这一难题。There are so many designs that I'm at a loss which to choose. 款式如此之多，我不知该选哪个。Facing risks, human beings are not at a loss what to do. 面对风险，人类并非处于亏损该怎么办。She was at a loss how to cope with the situation. 她不知如何去应付这种局面。He is always at a loss what to say in front of strangers.他在生人面前总是不知要说什么。 3. at a loss 之后直接跟动词不定式：She is at a loss to know what to do. 她不知道干什么好。I am at a loss to remember his name. 我一下子记不起他的名字。One is at a loss to suggest a possible improvement. 人们不知该如何提出可能的改进方法。She was at a loss to give words to indignation. 她简直不知道该如何用语方来表达她的义愤。I was at a loss to give response to his challenge. 我不知该对他的挑战做出什么反应。Detectives are so far at a loss to explain the reason of his de...
