It is said that potato chips ________ by mistake about a hundred years ago．
A．invent B．invented C．are invented D．were invented
科目：初中英语 来源： 题型：
It is said that potato chips ________ by mistake about a hundred years ago．
A．invent B．invented C．are invented D．were invented
科目：初中英语 来源：复习与测评 单元综合测试卷 九年级上册(配合牛津英语) 牛津版 题型：017
It is said that potato chips ________ by mistake about a hundred years ago．
A．invent
B．invented
C．are invented
D．were invented
科目：初中英语 来源：不详 题型：单选题
| A．invent | B．invented | C．are invented | D．were invented |
科目：初中英语 来源：2012届广西南宁初中学校城乡共同体九年级中考模拟考试英语试卷（带解析） 题型：单选题
It is said that potato chips ____________ by mistake about a hundred years ago.
| A．invent | B．invented | C．are invented | D．were invented |
科目：初中英语 来源： 题型：
It is said that potato chips in KFC _________ by mistake about one hundred years ago．
A．were invented B．invented C．was invented D．is invented
科目：初中英语 来源：2007年湖南省怀化市初中毕业学业考试英语试题 题型：017
It is said that potato chips in KFC ________ by mistake about one hundred years ago．
A．were invented
B．invented
C．was invented
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