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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Old buses are major（）to air pollution in this city. (contribute)

高老师2年前 (2024-03-26)综合英语（二）(00795)10

Complete the following sentence with a (compound) word derived from the one(s) given in bracket.

Old buses are major（）to air pollution in this city. (contribute)

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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.Old buses are major（ ）to air pollution in this city. (contribute)