10．My father wonders when personal computers           ．（　�。�
A．are inventedB．were inventedC．inventedD．have invented

分析 我爸爸想知道個(gè)人電腦是什么時(shí)候被發(fā)明的．

解答 答案：B 根據(jù)賓語(yǔ)從句when personal computers…，主語(yǔ)為personal computer"個(gè)人電腦是謂語(yǔ)動(dòng)詞"發(fā)明"invent的動(dòng)作承受者，所以為被動(dòng)關(guān)系．被動(dòng)語(yǔ)態(tài)結(jié)構(gòu)為"be+過(guò)去分詞"．選項(xiàng)A：一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài)，其結(jié)構(gòu)為：am/is/are+過(guò)去分詞；選項(xiàng)B：一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)，其結(jié)構(gòu)為：was/were+過(guò)去分詞；C：一般過(guò)去時(shí)，主動(dòng)語(yǔ)態(tài)；D：現(xiàn)在完成時(shí)，主動(dòng)語(yǔ)態(tài)．故可排除C，D．又因個(gè)人電腦的發(fā)明是發(fā)生在過(guò)去的動(dòng)作，故應(yīng)用一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)．故選B．

點(diǎn)評(píng) 此題考查句子的時(shí)態(tài)和語(yǔ)態(tài)．考生需先根據(jù)主語(yǔ)與謂語(yǔ)動(dòng)詞關(guān)系判斷使用主動(dòng)語(yǔ)態(tài)還是被動(dòng)語(yǔ)態(tài)，再根據(jù)動(dòng)作發(fā)生的時(shí)間判斷是一般現(xiàn)在時(shí)還是一般過(guò)去時(shí)．

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