In the past several weeks, many cities in Northern China________from heavy fogs, causing great inconvenience to people.
| A．suffered | B．have been suffering |
| C．were suffered | D．had been suffered |
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In the past several weeks, many cities in Northern China________from heavy fogs, causing great inconvenience to people.
| A．suffered | B．have been suffering |
| C．were suffered | D．had been suffered |
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