Question

Supply a verb in agreement with its subject:
Each book in the series _____ a foreword by a noted author.

• A. have
• B. let
• C. come
• D. has

Answer 1

Answer: (D)

It is to be kept in mind that Either, Neither, Each, Everyone, Many a, must be followed by a singular verb.
'Either book in the series' means each individual book. So, we are referring to a singular noun. By the general convention, a singular noun takes a singular verb.
Hence, option C 'has' is correct and option B 'have' is wrong.
Options A and Option D are irrelevant to the context.