单项选择题

Do you still remember ______ to our president when you visited our school last term

A．to be introduced
B．being introduced
C．introduced
D．to have been introduced
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单项选择题
He is the only one of the students who ______ a winner of scholarship for three years.
A．is
B．are
C．have been
D．has been
单项选择题
The food will go ______ if you don't put it in the fridge.
A．wrong
B．bad
C．away
D．out
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