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
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单项选择题
--______of his parents liked pop music. -- So they did. It is noisy.
A．All
B．None
C．Both
D．Neither
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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