单项选择题
A.operations
B.utilization
C.accomplishments
D.extreme importance
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单项选择题
A.a possibilityB.a certaintyC.a chanceD.a probability
A.a possibility
B.a certainty
C.a chance
D.a probability
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单项选择题
A.rangeB.termC.periodD.run
A.range
B.term
C.period
D.run
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