摘要：A invent B invented C are invented D were invented ( ) 2 A: John has hurt his leg. B: Really? . A who did that B How did that happen C What’s wrong with him D Why was he so careless Lesson 42 It Only Takes a Moment! 夯实基础
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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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I think mobile phone was ________ after the car.
A. invent
B. invented
C. discover
D. discovered
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