So many nights we could see the boy___in a book while others were already soundly sleeping

问题描述:

So many nights we could see the boy___in a book while others were already soundly sleeping
A bury B burying C buried D being buried

选C.
过去分词做后置定语,修饰前面的boy,表示完成.
sb be buried in sth 某人置身于某物