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I found he-------(explain) the problem to his students when

学习时间:2026-06-04 18:54:17 阅读：6267

I found he_______(explain) the problem to his students when I walked into his office.

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哭泣的超短裙

无限的胡萝卜

2026-06-04 18:54:17

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was explaining过去进行时,表示我走进办公室的时候他正在进行,是同时发生,且为过去,所以用过去进行时

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2026-06-04 18:54:17
was explaining过去进行时,表示我走进办公室的时候他正在进行,是同时发生,且为过去,所以用过去进行时

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