20．It was Edison whoinvented（發(fā)明） the first bulb．

分析 是愛迪生發(fā)明了第一個(gè)燈泡．

解答 invented 考查動(dòng)詞．根據(jù)句意：是愛迪生發(fā)明了第一個(gè)燈泡．invent是動(dòng)詞"發(fā)明"，因?yàn)槭沁^去時(shí)，所以答案填invented．

點(diǎn)評(píng) 動(dòng)詞是英語(yǔ)句子考查的重點(diǎn)內(nèi)容，掌握各種動(dòng)詞的用法，并能正確判斷動(dòng)詞在句中的時(shí)態(tài)和語(yǔ)態(tài)，以及是否考查非謂語(yǔ)，才能正確做出動(dòng)詞的題目．

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