18.A middle school student invented a new robot last term.(改為被動語態(tài))
A new robotwasinventedby a middle school student last term.

分析 一個中學生上學期發(fā)明了一個新的機器人.
一個新的機器人上學期被一個中學生發(fā)明了.

解答 答案:was invented
首先注意時態(tài),根據(jù)時間狀語last term可知為過去的時間,本句是對過去事實的一般描述,需用一般過去時;根據(jù)所給的句子,原句為主動語態(tài),要求改為被動語態(tài),被動語態(tài)中主語為動作的承受者,本句動作的承受者為a new robot,后加be動詞+過去分詞,表示"被發(fā)明",考慮時態(tài),此處主語為單數(shù),be動詞為was,invent的過去分詞為invented,因此為"was invented".

點評 考生需先理解句意,再結(jié)合句法結(jié)構(gòu),推測出所要填的詞語的正確形態(tài).

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