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

学习时间:2026-08-16 08:02:25 阅读：4668

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

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生动的白羊

哭泣的导师

2026-08-16 08:02:25

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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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开心的心锁
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2026-08-16 08:02:25
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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