Questões de Concurso Militar EEAR 2012 para Sargento da Aeronáutica - Aeronavegantes e Não-Aeronavegantes
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Since astronaut Yuri Gagarin became the first man to travel in space in 1961, scientists _________ what effects space travel has on the human body.
(Adapted from Active Skills)
Fill in the blank with the correct verb tense.