D
被发明,用被动语态,且为复数
It is said that potato chips ______ by mistake about a hundred years ago
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
A was invented
B are invented
C is invented
D were invented
英语人气：938 ℃时间：2020-02-04 15:53:57
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