分析如下:(a)中的 lay 显然应为过去分词,但实际上,不论是 lie 还是lay,其过去分词都与此无关。故(a)形式不成立。(b)中的 laid 是 lay的过去分词,但 lay 为及物动词,主语 the book 与它应构成被动语态形式。所以(b)也是错的。(c)的形式本身是成立的,但是由于动词 lay 通常为短暂动词,而短暂动词是不可以跟表示一段时间的状语连用的,所以(c) The analysis is as follows: The lay in (a) should obviously be the past participle, but in fact, whether it is lie or lay, its past participle has nothing to do with it. Therefore, the form of (a) is not established. Lay in (b) is the past participle of lay, but lay is a transitive verb and the subject and the book should form a passive voice form. So (b) is also wrong. The form of (c) itself is established, but because the verb lay is usually a short verb, and the short verb cannot be used in conjunction with an adverb that represents a period of time, (c)