19．On stepping into the classroom，she was astonished to find the desk_____with something unknown．（　　）
A．coveredB．coveringC．to coverD．to be covered

分析 一邁進(jìn)教室時(shí)，她就驚奇地發(fā)現(xiàn)了書桌上蓋著一件不為人知的東西．

解答 答案：A
此處在句中作賓語(yǔ)補(bǔ)足語(yǔ)，由于動(dòng)詞cover與賓語(yǔ)the desk構(gòu)成被動(dòng)關(guān)系，表示已完成的動(dòng)作，應(yīng)使用過(guò)去分詞形式；因此此處符合"find sth．done"這一結(jié)構(gòu)，故選A．

點(diǎn)評(píng) 做本題時(shí)，需要掌握過(guò)去分詞用在固定結(jié)構(gòu)"find sth．done"中，作賓語(yǔ)補(bǔ)足語(yǔ)，表示被動(dòng)與完成的用法．

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