一道高中英语选择题(twice a year)_____ twice a year , whether it is a car or a bus or a truck ,is the role that everyong must obey in the city.A.ExaminedB.Being examined答案是BA为什么不对?谢谢

一道高中英语选择题(twice a year)_____ twice a year , whether it is a car or a bus or a truck ,is the role that everyong must obey in the city.A.ExaminedB.Being examined答案是BA为什么不对?谢谢
一道高中英语选择题(twice a year)
_____ twice a year , whether it is a car or a bus or a truck ,is the role that everyong must obey in the city.
A.Examined
B.Being examined
答案是B
A为什么不对?
谢谢

一道高中英语选择题(twice a year)_____ twice a year , whether it is a car or a bus or a truck ,is the role that everyong must obey in the city.A.ExaminedB.Being examined答案是BA为什么不对?谢谢
分析句子成分：
_____ twice a year －－－－主语
whether it is a car or a bus or a truck－－－插入语不必考虑成分
is －－－谓语动词
the role that everyong must obey in the city.－－－宾语
再考虑能充当主语的名词、代词、动名词、不定式等.
而被动式放在开头只能充当状语,表示与主语之间是被动关系.所以,为了使句子成分完整不缺主语且保持与主语被动关系用being examined.
答案是正确的.

车辆是被检查,这里用现在分词的被动语态
看清楚这里是ving做主语

答案完全正确的.
car当然是被examined
故用被动.

答案是错的
请LimitFan看清楚,两个答案都是被动
B用ING形式是为强调动作正在进行,显然不和题意

如果用examined,那么examined是过去分词在句中作定语，原句就缺少主语了。而being examined是动名词的被动形式，既能表达出被动的意思，又能补足原句中残缺的主语。