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
On reaching the top floor I suddenly realized that I ______my book on the service desk.
A．leaves
B．left
C．had left
D．was left
单项选择题
The professor, together with his students______ capable of doing the skilled work now.
A．is
B．are
C．being
D．have
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