18．It is said that potato chips ____________ by mistake about a hundred years ago．（　　）
A．inventB．inventedC．are inventedD．were invented

分析 據(jù)說薯條是在大約100年前誤打誤撞而發(fā)明的．

解答 答案：D
首先根據(jù)時間狀語about a hundred years ago，判斷用一般過去時，主語potato chips是動作invent的承受者，所以用被動語態(tài)，一般過去時被動語態(tài)的構(gòu)成是：主語+was/were+動詞的過去分詞，主語是復(fù)數(shù)名詞，be動詞用were，invent的過去分詞是invented，故選D．

點評 本題考查時態(tài)和語態(tài)．每個時態(tài)都有標(biāo)志詞，熟記這些標(biāo)志詞是做題的關(guān)鍵．在沒有時間狀語的情況下可以根據(jù)語境來對時態(tài)做出判斷．

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