With an appropriate relative pronoun or relative adverb:
(1)This is the best biography ____ I have read of Churchill. (2)He is straight A student, ____ his brother never was.
that; which
With an appropriate relative pronoun or relative adverb:
(1)This is the best biography ____ I have read of Churchill. (2)He is straight A student, ____ his brother never was.
that; which