单项选择题

A new technique（）, the gross output increased by 20 percent.

A. working out
B. having worked out
C. having been worked out
D. to have been worked out

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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
单项选择题
On the beach she could hardly（）him from the other swimmers.

A. figure
B. tell
C. recognize
D. know
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