他突然从座位上站起来,吓了我一跳。

He suddenly stood up from his seat, which startled me.

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He suddenly stood up from his seat, which startled me.

suddenly 是形容词 sudden(突然的)加上后缀 -ly 构成的副词形式,表示"突然地、意外地"。 stood 是动词 stand(站立)的过去式,表示"站立"的动作发生在过去。

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