单选题 One of the workers (has) (hung) the curtains that (had) been (laying) on the floor.
  • A. has
  • B. hung
  • C. had
  • D. laying


【正确答案】 D
【答案解析】改为lying。lie表示“躺,位于”时,过去式是lay,现在分词是ly-ing。而lay为动词“放置,搁放”的原形,如lay the table。此处为前者,故用lying。