单项选择题

A programmed computer begins to show on its screen the figures you need（）

A．when switched on
B．switched on
C．to be switched on
D．being switched on

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No matter how frequently（）, the works of Beethoven always attract large audiences.

A．performing
B．performed
C．to be performed
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Please take what you like, you（）eat too much.

A．may not
B．would not
C．must not
D．can not
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