单项选择题

When do children start school in the man’s country How long do children usually stay at university in the man’s country

A．Three or five years.
B．Three or four years.
C．Three to four years.
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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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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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