Choose the item that best completes this sentence: Flashbacks are used O A) primarily in science fiction
B) primarily in historical novels
OC) primarily in biographies
OD) in a wide variety of literary forms

1. in which sentence is the underlined portion a predicate nominative? for astronauts, going into space to repair orbiting equipment becomes a challenge. for astronauts, going into space to repair orbiting equipment becomes tricky. for astronauts, going into space to repair orbiting equipment becomes challenging. for astronauts, going into space to repair orbiting equipment becomes frequent.