单项选择题

It was essential that a meeting（）this week.

A. must be convened
B. would be convened
C. be convened
D. was convened

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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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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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