问题
选择题
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
答案
答案：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。
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