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【单选题】

The sky was so clear in fact that the communications crew and recovery team could watch the balloon ______ to its maximum altitude with the naked eye.
A.hike

B.elevate
C.escalate
D.ascend
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根据网考网移动考试中心的统计,该试题:

12%的考友选择了A选项

22%的考友选择了B选项

5%的考友选择了C选项

61%的考友选择了D选项

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