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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单项选择题
The house is very big and beautiful. I think the rent must be（）as that one.

A．three times more
B．as much three times
C．three times as much
D．as three times more
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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