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Popunjavanje rečenica - Past Simple vs. Past Perfect Continuous

Napišite glagole u zagradama u odgovarajućem glagolskom obliku. Koristite Past Simple ili Past Perfect Continuous.
1) George Engelmann (study) medicine in Germany for several years before he (graduate) at Würzburg.
2) Before he (open) his medical practice, he (struggle)with financial difficulties.
3) He (settle) in St. Louis after he (wander) on horseback across the frontier.
4) By the time he (write) his autobiography, he(collect)  notes for decades.
5) Engelmann (travel) through Illinois and Arkansas for months when he  (decide) to return to St. Louis.
6) Before he (become) well known, he (work) tirelessly both as a physician and botanist.
7) By the time he (start) teaching, he (conduct) experiments for several years.
8) He (correspond) with scientists abroad when his mother   (visit) him.
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