问题
选择题
______ he referred to in his article was unknown to the general reader.
A．That
B．What
C．Whether
D．Where
答案
答案：A
主要测试主语从句。句子______ he referred to in his article在复合句中充当主语，同时该句子中缺少介词to的宾语，双重作用。答案一目了然。
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