We don’t have to change the water in an aquarium frequently if ___________.

Câu hỏi:

We don’t have to change the water in an aquarium frequently if ___________.

A.
there are two-inch fish.

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B.
we often change the plants.

C.
we often feed the snails.

D.
a lot of plants and snails are kept there.

Đáp án đúng: D