It is said that potato chips ____________ by mistake about a hundred years ago.
A．inventB．inventedC．a(chǎn)re inventedD．were invented
D
考察時態(tài)及語態(tài)。句意；據(jù)說炸薯片是100年前錯誤的被發(fā)明的。結(jié)合語境可知本句描述的是過去的狀態(tài)，故用一般過去時態(tài)。句子主語是動作對象，故用被動語態(tài)。選D。
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