It is said that potato chips ________ by mistake about one hundred years ago.


  1. A.
    invent
  2. B.
    invented
  3. C.
    are invented
  4. D.
    were invented
D
題中有ago，要用一般過(guò)去時(shí)態(tài)；薯?xiàng)l是被發(fā)明的，因此要用被動(dòng)語(yǔ)態(tài)。所以選擇D。
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