单项选择题

You ______ him so severely. It was none of his business.

A. needn't have scolded

B. needn't scold
C. mustn't have scolded

D. mustn't scold
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单项选择题
Everything in the universe undergoes ______ development and change.
A. continuous
B. continual
C. continued
D. constant
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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