单项选择题

He failed the exam, ______ proved that he hadn't been working hard enough.

A．that
B．which
C．what
D．of which
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单项选择题
I don't think there is ______ in the book on the desk.
A．something important
B．anything important
C．important something
D．important anything
单项选择题
Seldom ______ my boss in such a good mood since I came to work in this company.
A．I saw
B．have I seen
C．I have seen
D．do I see
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