Itissaidthatpotatochips________by

发布时间:2020-07-12 13:22:22

It is said that potato chips ________ by mistake about one hundred years ago.A.inventB.inventedC.are inventedD.were invented

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D解析题中有ago,要用一般过去时态;薯条是被发明的,因此要用被动语态。所以选择D。
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