单项选择题

A．measure
B．keep
C．maintain
D．grade
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单项选择题
A．Turn down the volume.B．Help the man study for a test.C．Play a different kind of music.D．Speak louder.
A．Turn down the volume.
B．Help the man study for a test.
C．Play a different kind of music.
D．Speak louder.
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