【单选题】
But from the start of their experiments, the Wright brothers found that they needed money to pay ______ their research.
A.back
B.down
C.for
D.off
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根据网考网移动考试中心的统计,该试题:
17%的考友选择了A选项
7%的考友选择了B选项
66%的考友选择了C选项
10%的考友选择了D选项