单选题
All that he had learned only made him feel how little he knew in comparison with ______ remained to be known.
A、
what was
B、
what
C、
which was
D、
that
【正确答案】
B
【答案解析】
what引导一个名词性从句，作with的宾语，相当于in comparison with the thing that remained to be known。
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