3．The professor was delighted to find that two thirds of the projecthad already been finished by the students independently．（finish）
教授高興地發(fā)現(xiàn)學(xué)生們已獨(dú)立完成了該項(xiàng)目三分之二的工作．

分析 "教授發(fā)現(xiàn)…"這一動(dòng)作發(fā)生在過去，而學(xué)生完成工作應(yīng)該在"發(fā)現(xiàn)"之前．所以發(fā)生在"過去的過去"，故應(yīng)用過去完成時(shí)．又由于project和finish之間是被動(dòng)關(guān)系，所以應(yīng)用過去完成時(shí)的被動(dòng)語(yǔ)態(tài)．

解答 had （already） been finished

點(diǎn)評(píng) 考查語(yǔ)態(tài)和時(shí)態(tài)，要根據(jù)句子中的關(guān)鍵動(dòng)詞或時(shí)間狀語(yǔ)判斷．

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