单项选择题

So little（）about mathematics that the lecture was completely beyond me.

A．I know
B．I knew
C．do I know
D．did I know

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单项选择题
The room is in a terrible mess; it（）cleaned.

A．mustn't have been
B．shouldn't have been
C．can't have been
D．wouldn't have been
单项选择题
No matter how frequently（）, the works of Beethoven always attracts large audience.

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