单项选择题

() it or not, his discovery has created a stir in scientific circles.

A. Believe
B. To believe
C. Believing
D. Believed

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Please don’t be angry. I()to help rather than to hurt you.

A. plotted
B. managed
C. supposed
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If only the committee () the regulations and put them into effect as soon as possible.

A. approve
B. will approve
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