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Câu hỏi:
We don’t have to change the water in an aquarium frequently if ___________.
- A. there are two-inch fish.
- B. we often change the plants.
- C. we often feed the snails.
- D. a lot of plants and snails are kept there.
Lời giải tham khảo:
Đáp án đúng: D
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