单项选择题

—What about the book
—Oh, very good. It's worth ________ a second time.

A．reading
B．being read
C．to read
D．to be read
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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．had forgotten
B．left
C．had left
D．was left
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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