Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 2)

People say that nuclear energy has caused lots of problems. Nuclear energy is

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People say that nuclear energy has caused lots of problems

->Nuclear energy is

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People say that nuclear energy has caused lots of problems.

->Nuclear energy is said to have caused lots of problems.