单项选择题

Everything in the universe undergoes ______ development and change.

A. continuous
B. continual
C. continued
D. constant
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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
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
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