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

学习时间:2026-04-03 08:09:54 阅读：800

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

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现实的裙子

还单身的白猫

2026-04-03 08:09:54

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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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忐忑的小刺猬
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2026-04-03 08:09:54
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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