A vast area north of the Yangtze River__________by the first heavy snow of the new year,causing difficulties to the post-festival road transport.
| A．were affected |
| B．was affected |
| C．had affected |
| D．has affected |
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A vast area north of the Yangtze River__________by the first heavy snow of the new year,causing difficulties to the post-festival road transport.
| A．were affected |
| B．was affected |
| C．had affected |
| D．has affected |
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