All possible means have been used to prevent air p...

Câu hỏi: All possible means have been used to prevent air pollution. The sky is still not clear.

A Every possible means has been used to prevent air pollution so that the sky can be clearer.

B The sky is still not clear due to the fact that all possible means have been used to prevent air pollution.

C To prevent air pollution, every possible means has been used, and so the sky is still not clear.

D Every possible means has been used to prevent air pollution, yet the sky is still not clear.