It is said that potato chips ______ by mistake about a hundred years ago
题目
It is said that potato chips ______ by mistake about a hundred years ago
A was invented
B are invented
C is invented
D were invented
答案
D
被发明,用被动语态,且为复数
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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