But from the start of their experiments, the Wright brothers found that they nee

游客2025-03-13 7

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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