With the city ________ clouded by dirty smog, the government has planned to shut down the four major coal-fired power plants.
| A．abruptly | B．frequently |
| C．occasionally | D．regularly |
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With the city ________ clouded by dirty smog, the government has planned to shut down the four major coal-fired power plants.
| A．abruptly | B．frequently |
| C．occasionally | D．regularly |
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