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?xiàng)l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(shí)間狀語(yǔ)about a hundred years ago，判斷用一般過去時(shí)，主語(yǔ)potato chips是動(dòng)作invent的承受者，所以用被動(dòng)語(yǔ)態(tài)，一般過去時(shí)被動(dòng)語(yǔ)態(tài)的構(gòu)成是：主語(yǔ)+was/were+動(dòng)詞的過去分詞，主語(yǔ)是復(fù)數(shù)名詞，be動(dòng)詞用were，invent的過去分詞是invented，故選D．

點(diǎn)評(píng) 本題考查時(shí)態(tài)和語(yǔ)態(tài)．每個(gè)時(shí)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(shí)間狀語(yǔ)的情況下可以根據(jù)語(yǔ)境來(lái)對(duì)時(shí)態(tài)做出判斷．

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