单选题
He failed the exam, ______ proved that he hadn't been working hard enough.
A、
that
B、
which
C、
what
D、
of which
【正确答案】
B
【答案解析】
[解析] 本题考查非限制性定语从句。这里关系代词代替整个主句，只能由which引导。
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