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A vast area north of the Yangtze River__________by the first

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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
A vast area north of the Yangtze River__________by the first
B

句子的主语为A vast area north of the Yangtze River,所以谓语动词要用单数形式,只能在B项和D项中选择;又因为D项语态不对,所以正确答案为B项。