单项选择题

John usually asks（）more questions in class than his classmates.

A. far
B. many
C. a great deal
D. lot

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

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