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Verbal·Craft and Structure·Words in Context

hard

Although our knowledge of the Pleistocene epoch and the lives of hominids during this time was once       , recent analyses of fossils like that of the individual known as Petralona 1, discovered in Greece in 1960, have sharpened our picture of what a day in the life of Petralona 1 may have looked like.

Which choice completes the text with the most logical and precise word or phrase?

A

unprecedented

B

nebulous

C

intricate

D

concrete