Preterite: completed action, beginning/end to a past action, narrate past events
Imperfecto: ongoing action, habitual past actions, mental/physical/emotional state
The answer would be vistieron
<u>Answer</u>
<em>According to NCSU, Developing a new vaccine from scratch takes considerable time. It depends a lot on how much information is available about the disease itself, how the disease infects people and spreads, and so on. But it traditionally has taken 5-10 years to get a new vaccine.</em>
<em>In my opinion, it depends. This means that it could take as little time or a long time. In general, it would take some time, but not much to this day. It would most likely take lots of years for </em><u><em>everyone in the world</em></u><em> to get the vaccines though.</em>
<em>#TeamTrees</em>
<em>Hope this helps! <3</em>
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