Within the last year, scientists have e closer than ever .
A. to deciding which of the questions is right
B. to decide which of the questions is right
C. deciding whether the question is right or not
D. and decided which of the questions is right
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(答案→)A. to deciding which of the questions is right
B. to decide which of the questions is right
C. deciding whether the question is right or not
D. and decided which of the questions is right
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