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_______ but also it filters out harmful rays.

A. Environment gives us air to breathe
B. Not only does the environment give us air to breathe
C. The environment that gives us air to breathe
D. Not only the environment gives us air to breathe
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সঠিক উত্তরঃ B. Not only does the environment give us air to breathe
Explanation: Sentences started with ‘Not only………but also’ adverbials are treated as inversions. The ‘inverted’ sentences follow the structure: ‘auxiliary verb/do/did/does + subject +base form of the main verb’.