单项选择题

A．economics
B．biology
C．politics
D．science
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单项选择题
A．onB．inC．atD．round
A．on
B．in
C．at
D．round
单项选择题
A．She doesn’t often play it.B．She plays it whenever she can.C．She plays casually, not following any routine.D．When she has time she plays it on and off.
A．She doesn’t often play it.
B．She plays it whenever she can.
C．She plays casually, not following any routine.
D．When she has time she plays it on and off.
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