2. 外语
  3. But from the start of their experiments, the Wright brothers found that they needed money to pay ______ their research.

But from the start of their experiments, the Wright brothers found that they needed money to pay ______ their research.

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问题 But from the start of their experiments, the Wright brothers found that they needed money to pay ______ their research.
选项 A、back
B、down
C、for
D、off
答案C
解析 pay for付款；pay off偿清。根据题意选C。pay不与其他两项搭配使用。
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