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| goodness knows; it's anybody's guess (Anglophile) | |||
| how long is a piece of string? (Обычно в ответ на вопрос: "Сколько времени это займет?" и т.п. AnnaOchoa) | |||
| you never know (You never know–you might win the lottery. VLZ_58); one never knows (Alex_Odeychuk) | |||
| toss-up (VLZ_58) | |||
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| who knows? | |||
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| who knows? | |||
| кто его знает: 23 phrases in 4 subjects |
| Bible | 1 |
| General | 16 |
| Informal | 2 |
| Makarov | 4 |