I .Sentence bransformation "Air pollution is one the causes of the greenhouse effect" scientists said =>Scientists said.......
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Scientists said that air pollution was one the causes of the greenhouse effect.
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"Air pollution is one the causes of the greenhouse effect" scientists said
⇒ Scientists said that air pollution was one the causes of the greenhouse effect.
(Câu gián tiếp: HTĐ chuyển thành QKĐ)
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