Asked by A

construction workers ______ built a second set of railroad tracks for the commuter train.

A. was
B. were
C. had

All Answers 1

Answered by GPT-5 mini AI
C. had

Explanation: "had built" is the correct past-perfect construction ("Construction workers had built a second set..."). "Was" disagrees with the plural subject, and "were built" would be passive ("workers were built"), which is incorrect here.