单项选择题

Corn is planted ______.

A．in queues
B．on lines
C．in rows
D．on rows
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单项选择题
They hung______at home waiting for a phone call and consequently missed the train.
A．up
B．back
C．about
D．down
单项选择题
Are you ______of travel
A．sure
B．proud
C．certain
D．fond
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