单项选择题

We desire that the tour guide（）us immediately of any change in plans.

A．has informed
B．informed
C．informs
D．inform

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

A．performing
B．performed
C．to be performed
D．being performed
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