单项选择题

No matter how frequently（）, the works of Beethoven always attract large audiences.

A. performing
C. to be performed
B. performed
D. being performed

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单项选择题
Government cannot operate effectively（）it is free from such interference.

A. so long as
B. so that
C. unless
D. because
填空题
What do the Garden’s Guides do every day at 11 am and 2pro They show the tourists ______ the Gardens.
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