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Which option best completes the paragraph below?
What is Marine Engineering?
About a century ago no one ______about a marine engineer, but today it ______as established as any other famous ones. Over the last 100 years, engineering as a field of study ______ and diversified far beyond what ______ imagined prior to this period. Not only this, it has also branched out into various specialized fields that ______ great progress. Most of these new fields are aligned to any of the basic engineering branches like mechanical, electrical, civil, electronics, computers etc and have something or the other incorporated from them. One such branch is called marine engineering.
(Adapted from http: / / www. marineinsight. com / careers)
What is Marine Engineering?
About a century ago no one ______about a marine engineer, but today it ______as established as any other famous ones. Over the last 100 years, engineering as a field of study ______ and diversified far beyond what ______ imagined prior to this period. Not only this, it has also branched out into various specialized fields that ______ great progress. Most of these new fields are aligned to any of the basic engineering branches like mechanical, electrical, civil, electronics, computers etc and have something or the other incorporated from them. One such branch is called marine engineering.
(Adapted from http: / / www. marineinsight. com / careers)
Resolução comentada
A opção A forma uma sequência coerente de tempos e modais.
'No one would have heard' indica uma situação hipotética no passado. 'Today it is as established' está no presente. 'Has developed' liga o passado ao presente (over the last 100 years). 'Could have been imagined' completa 'beyond what...'. 'Fields that have achieved great progress' fecha o período.
Análise das alternativas
As demais opções misturam tempos, como 'would hear' no futuro do pretérito ou 'has been developed' sem sentido passivo, e produzem frases incoerentes. Ex.: 'have been achieved' não combina com 'fields that ... great progress'.
Referência: Verb tenses e modais perfeitos.
Resolução comentada do VaiConcursos.