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
网友回答
A. were affected
(答案→)B. was affected
C. had affected
D. has affected
解析：
这题考查时态语态，句意是：长江以北的大面积地区被新年的第一场大雪影响，所以用被动式，另外因为主语是单数，所以用was affected，选B。