The moon: condicionais mistas (B2)
The Moon keeps one face permanently turned towards us, a consequence of tidal forces that slowed its rotation until it matched its orbit. The far side was therefore a complete mystery until a Soviet probe photographed it in 1959, and the images revealed a surface far more heavily cratered, with almost none of the dark volcanic plains that dominate the side we see. If the Moon were not tidally locked, astronomers ___ that difference centuries ago, and our theories of planetary formation would have taken a different route. Today the far side has practical value as well: it is permanently shielded from terrestrial radio noise, which makes it the best site in the inner solar system for the kind of radio telescope that cannot function on Earth.
Fonte: English for ALL (texto original).
Assinale a alternativa que completa corretamente a lacuna do texto.
- A) would map
- B) will have mapped
- C) had mapped
- D) would be mapping
- E) would have mapped