A group of dogs are known as therapy dogs.这种a group of... a committee of...到底是用单数还是复数呢?
A group of 后面接复数名词。"A group of + 复数名词" 作主语时,谓语动词用复数或者单数都可以。如:
A large group of people were waiting for him at the airport. 一大群人在机场等候他。(摘自《韦氏高阶英汉双解词典》p.934)
A select group of scientiats has been invited to the conference. 一群科学家精英已受邀参加会议。(同上)
a committee of 后面接复数名词。如: a committee of experts 专家委员会 (摘自《牛津英语搭配词典》第2版 committee 词条)