Questions & Answers about В поликлинике я жду в очереди и читаю журнал.
Because в поликлинике is prepositional case and answers where? (location): in/at the clinic.
В поликлинику would be accusative and answers where to? (motion/destination): to the clinic.
Поликлиника is typically an outpatient clinic (appointments, general practitioners, specialists, tests—usually no overnight stay).
Больница is a hospital, where people can be admitted and stay.
Both are possible but emphasize different things:
- я жду в очереди = I’m waiting in the line/queue (focus on waiting).
- я стою в очереди = I’m standing in line (focus on physically standing).
In many real situations people wait while also standing, so жду is very natural.