单项选择题

Second-hand ears are ______ to buy than new ones.

A．cheap
B．cheaper
C．cheapest
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单项选择题
To go to the hospital, you must ______ the bus at Eastwind Hotel.
A．stop
B．leave
C．get off
单项选择题
I don't ______ when I heard from him.
A．remember
B．learn by heart
C．keep in mind
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