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17．---Do you know when computerswere invented （invent）？---In the 20^th century．

分析 --你知道計算機是什么時候發(fā)明的嗎？
--在二十世紀(jì)．

解答答案：were invented 考查單詞填空．根據(jù)句意你知道計算機是什么時候發(fā)明的嗎？要用被動語態(tài)，結(jié)合回答在二十世紀(jì)．是一般過去時，構(gòu)成是be+過去分詞，主語computers是復(fù)數(shù)形式，故系動詞用were，invent的過去分詞是invented，故答案是were invented．

點評考查單詞填空．準(zhǔn)確的翻譯句意及分析句子結(jié)構(gòu)，確定用合適時態(tài)，用詞的正確形式完成句子是關(guān)鍵．

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Titles：Some good manners in modern life

Items	Do's	Don'ts
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