[u]Optimists believe[/u] that [u]in future[/u] we will be [u]living in a cleaner[/u] environment, breathing fresher air and [u]eat healthier

Optimists believe that in future we will be living in a cleaner environment, breathing fresher air and eat healthier food.
A. Optimists believe B. in future C. living in a cleaner D. eat healthier food
 

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Đáp án: D thành “eating healthier food”
Giải thích: Đây là dạng cấu trúc tương đương. Ta thấy đằng trước D là 2 Ving (living và breathing) nên D cũng phải là Ving.