单项选择题

（）have we seen such an effective actor as he has proven himself to be.

A. Certainly
B. Sometimes
C. Rarely
D. Once

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单项选择题
They concentrated their efforts on（）products of high quality.

A. turning on
B. turning off
C. turning out
D. turning over
单项选择题
Having decided to rent a flat, we（）contacting all the accommodation agencies in the city.

A. set about
B. set down
C. set out
D. set up
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