সব প্রশ্নে ফিরে যান
English Grammar
Often visible as smog , ozone is formed in the atmosphere form" hydrocarbons and nitrogen oxides , two major pollutants emitted by automobiles react with sunlight .
A) ozone is formed in the atmosphere from
B) ozone is formed in the atmosphere when
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C) ozone is formed in the atmosphere when
D) ozone is formed in the atmosphere ,and when