Which verb form correctly completes the sentence?
Soon after he turned in his term paper, Bryan _______ he had left out the bibliography.
a. knew
b. known
c. know
d. had knew

Respuesta :

A. knew, because if you think about how they all sound, B and C could not work, since they sound kind of weird.  D sound like it could work, but only if it was "had known".  Therefore the only answer left to pick is "A. knew".

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