The old lady ________ through the key hole at her new neighbors.
句意:老妇从锁眼里窥视她的邻居。peep (through the key hole),意为“(从锁眼)窥视”。stare、gaze常与at/into搭配,意为“凝视”。glance through/at浏览(报纸、报告、书籍等)。所以选D。