By the time the inspector arrived, the engineer ___ a new topic.

Answer and explanation

Correct answer: A. had chosen

  1. Step 1: When one past action happened before another, the earlier one takes the past perfect.
  2. Step 2: Finishing came before the inspector arrived, so "had chosen" is needed.
Answer
had chosen.
Why not the others: chose, has chosen and would choose do not fit here.

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