摘要： It is said that potato chips by mistake about a hundred years ago.
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It is said that potato chips ____________ by mistake about a hundred years ago.
A. invent B. invented C. are invented D. were invented
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It is said that potato chips ____________ by mistake about a hundred years ago.
| A．invent | B．invented | C．are invented | D．were invented |
It is said that potato chips by mistake about a hundred years ago.
[ ]
A. invent
B. invented
C. are invented
D. were invented
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B. invented
C. are invented
D. were invented