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Category - Composition

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.

Pollution, population growth, and wasteful irrigation practices they are contributing to a worldwide water shortage.
  1. they are contributing
  2. are contributing
  3. they were contributing
  4. have been contributing
Explanation
Answer: B - The best choice is “are contributing”

“Are contributing” indicates the present continuous form, which expresses something that is currently happening. The pronoun “they” is unnecessary and affects the sentence’s clarity. Since the factors causing water shortages are ongoing, past tense forms of verbs are inappropriate.
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