单项选择题

This is one of the most beautiful songs（）I have ever heard.

A. what
B. which
C. that
D. as

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单项选择题
The manager hoped to be（）of how our business was going on.

A. informed
B. required
C. warned
D. suggested
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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