—The air pollution is terrible.

—It will be worse_____ we take action to protect the environment.

A. if B. unless

C. until D. when

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Smog is a big problem in many Chinese cities. But it seems that besides wearing a mask, few of us know what has caused the smog and what to do to beat it. Chai Jing, a former news interviewer with CCTV, discussed the questions in her documentary Under the Dome.

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