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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Our manager is so （） in his thinking, he never listens to new ideas.

A. stiff
B. rigid
C. tense
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A survey was carried out on the death rate of new-horn babies in that region, （） were surprising.

A. as results
B. which results
C. the results of it
D. the results of which
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