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
B?
句子的主語為A vast area north of the Yangtze River，所以謂語動詞要用單數(shù)形式，只能在B項和D項中選擇；又因為D項語態(tài)不對，所以正確答案為B項。?
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