语法与词汇 When a fire broke out at the National Exhibition in London, at least ten _____ paintingscompletely were destroyed.

【正确答案】 C

【答案解析】句意：伦敦国家展览馆发生火灾时，至少10件价值连城的画作被毁。priceless无价的；极珍贵的。valueless没有价值的；不值钱的。worthless没用的；无价值的。expensive贵的。