Choose the option that correctly completes the sentence:

One of the newly commissioned agricultural tractors _____ already broken down in the central field.

Answer and explanation

Correct answer: C. has

  1. Step 1: In 'One of the [plural noun]' without a relative pronoun, the true subject is the singular pronoun 'One'.
  2. Step 2: The singular subject requires the singular auxiliary 'has'.
Answer
has.
Why not the others: 'Have', 'are', and 'were' are plural verbs that falsely agree with the noun 'tractors'.

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