it's said that potato chips __by mistake about a hundred years ago A INVENT b inventedc are invented d were invented为什么选D 选B不行吗?

it's said that potato chips __by mistake about a hundred years ago A INVENT b inventedc are invented d were invented为什么选D 选B不行吗?
it's said that potato chips __by mistake about a hundred years ago A INVENT b invented
c are invented d were invented
为什么选D 选B不行吗?

it's said that potato chips __by mistake about a hundred years ago A INVENT b inventedc are invented d were invented为什么选D 选B不行吗?
首先,你应该知道主语是potato chips,谓语是invent,那么,薯条和发明之间是什么样的关系呢?是主动还是被动呢?不可能是薯条自己发明东西吧?所以,肯定是用被动语态be done 的形式.排除A,B.B的时态是过去时,表示过去发生的动作.
而C,D的不同是时态的不同,分别是一般现在时的被动和一般过去时的被动.由题目中的a hundred years ago,知道的过去发生的事情,所以选什么不用我说了吧?

D选项是表示被动，意思是薯片是偶然被发明的。B选项不能表示被动，不合逻辑。

d