单项选择题

Which of the following instruments was widely used before the seventeenth century

A．The harpsichord
B．The spinet
C．The clavichord
D．The organ
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单项选择题
The word it in line 9 refers to the
A．variety
B．music
C．harpsichord
D．clavichord
单项选择题
According to the information in the third paragraph, which of the following improvements made it possible to lengthen the tone produced by the piano
A．The introduction of pedals
B．The use of heavy wires
C．The use of felt-padded hammerhead's
D．The metal frame construction
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