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 Declaration of Independence, ______ the constitution of the United States, was drawn up with the help of Benjamin Franklin.
A．as well as
B．also
C．and
D．so too
单项选择题
Great as Newton was, many of his ideas today ______ and are being modified by the work of scientists of our time.
A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
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