Mandela, who spent nearly30 years locked in *,has died peacefully at the age of 95.

在这个句子里,尽管用 being locked 在语法上没有错,但语感上不如单用 locked.如果不是强调行为的过程,在表达被动状态时,单用过去分词短语作状语更为简洁明了.加了 being 显得累赘、咬文嚼字.试比较：
He was still awake along the way being taken to the hospital.
He was sipping red wine alone at a small round table in the corner,totally ignored by his friends at the party.