单项选择题

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

A．performed
B．performing
C．to be performed
D．being performed
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单项选择题
______ born in Chicago, the author is most famous for his stories about New York City.
A．Although
B．Since
C．As
D．When
单项选择题
We met Mary and her husband at a party two months ago. ______ we've had no further communication.
A．Thereof
B．Thereby
C．Thereafter
D．Thereabouts
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