By the end of next month, the workers ___ the documentary.

Answer and explanation

Correct answer: C. will have seen

  1. Step 1: An action that will be complete before a future time uses the future perfect.
  2. Step 2: The marker "by the end of next month" calls for "will have seen".
Answer
will have seen.
Why not the others: will see, have seen and would have seen do not fit here.

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