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
Malaria, it is true, has been practically ______ in thirteen countries, including the United States, and is under attack in many others.
A. wiped out
B. died out
C. put out
D. kept out
单项选择题
He was driving very fast because he was ______ of the fact that there was a speed limit.
A. innocent
B. aware
C. ignorant
D. sure
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