Question

Do you know Australia was, as a matter of fact,________ used to be a nation of prisoners?

A．what

B． where

C． which

D．that

Answer 1

A

考查名词性从句。句意“事实上，你知道吗？澳大利亚曾经是囚犯之国。”表语从句缺少主语，用what充当be的byuv.gu选A。