问题
选择题
It is said that potato chips ______ by mistake about a hundred years ago. [ ]
A. invent
B. invented
C. are invented
D. were invented
答案
答案：D
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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
答案：D
H2↑+CuSO4,试回答：