问题

It is said that potato chips ____________ by mistake about a hundred years ago.
A:invent
B:invented
C:are invented
D:were invented
B:invented
C:are invented
D:were invented
正确答案是:
同类题型
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Don’t worry. It won’t be long ______we see each other again.
Could you please have a walk with me?—Sorry, I _______. I have something important to do now.