While others sat at home studying papers on the subject, Jefferson got into a bo

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问题 While others sat at home studying papers on the subject, Jefferson got into a boat and made ______observations.

选项 A、of-the-spot
B、in-the-spot
C、on-the-spot
D、at-the-spot

答案 C

解析固定搭配。on—the—spot为固定搭配，意为“现场的”。故答案为C。

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