Bus drivers can not smoke or drink___ driving.此空when和while都可以填吗?

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Bus drivers can not smoke or drink___ driving.此空when和while都可以填吗?

Bus drivers can not smoke or drink___ driving.此空when和while都可以填吗?
Bus drivers can not smoke or drink___ driving.此空when和while都可以填吗?

Bus drivers can not smoke or drink___ driving.此空when和while都可以填吗?
while后面跟的必须是个从句.所以这个题填when