Our teacher helped us __ ___ ___(做一个有关……的研究) plants.

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Ourteacherhelpedus________(做一个有关……的研究)plants.Ourteacherhelpedus________(做一个有关……的研究)plants.Ourteacher

Our teacher helped us __ ___ ___(做一个有关……的研究) plants.
Our teacher helped us __ ___ ___(做一个有关……的研究) plants.

Our teacher helped us __ ___ ___(做一个有关……的研究) plants.
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