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【单选题】

After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
A．runs away

B．charges for
C．falls off
D．merges into
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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

33%的考友选择了B选项

61%的考友选择了C选项

1%的考友选择了D选项

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