单项选择题

They () on the program for almost one week before I joined them.

A．had been working
B．bad worked
C．have been working
D．have worked

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单项选择题

Peter () come tonight, but he isn't very sure yet.

A．must
B．may
C．can
D．will

单项选择题

I was hungry, for I () nothing all day.

A．ate
B．had eaten
C．am eating
D．have eaten

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