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 on—the-pot的意思是“立即，当场”，其他三个都不是固定搭配。所以，答案是C。

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