单项选择题

A．heard
B．to be heard
C．hearing
D．having head
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单项选择题
George Washington’s birthday was first celebrated ______.
A．before the War of Independence
B．after he died
C．after he became the President of the United States
D．during the War of Independence
单项选择题
A．musicB．noiseC．soundD．radiation
A．music
B．noise
C．sound
D．radiation
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