 |
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| the lesson ... is in progress | |||
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| a math, literature, etc. lesson is underway (Maria Klavdieva) | |||
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Class in session! (источник –  multitran.com dimock) | |||
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| the lesson ... is in progress | |||
| |||
| a math, literature, etc. lesson is underway (Maria Klavdieva) | |||
| |||
| Class in session! (источник – multitran.com dimock) | |||