Itissaidthatpotatochips

问题详情：

It is said that potato chips ______by mistake about a hundred years ago.

A. invent                                                                  B. invented

C. are invented                                                          D. were invented

【回答】

D  句意：据说薯片是大约一百年前偶然被发明的。本题考查动词的时态和语态。由时间状语a hundred years ago可看出句子应用一般过去时；potato chips与invent构成被动关系，故选D项。

知识点：动词语态

题型：选择题