Multiple choice

Smart students read English books in their spare time to ______ their English ability.

  1. exchange

  2. alter

  3. convert

  4. develop
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The infinitive "to" requires a base verb. "Develop" means to grow, improve, or become more advanced, which fits the context of improving language ability. "Exchange", "alter", and "convert" do not make sense in the context of improving skills.

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