---Mary,turn off the water__you are brushing your teeth.---Sorry.I will do it at once.A、until B、while C、though D、but

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---Mary,turn off the water__you are brushing your teeth.---Sorry.I will do it at once.A、until B、while C、though D、but
---Mary,turn off the water__you are brushing your teeth.
---Sorry.I will do it at once.
A、until B、while C、though D、but

---Mary,turn off the water__you are brushing your teeth.---Sorry.I will do it at once.A、until B、while C、though D、but
B 表示正在,同时