摘要： More and more people have come to realize-
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More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.
A．is not polluted B．would not be polluted
C．had not been polluted D．would not have been polluted
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More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.
- A.is not polluted
- B.would not be polluted
- C.had not been polluted
- D.would not have been polluted