【題目】When Mr. Li came in and saw the clean and tidy classroom, he was very satisfied and praised the students who were______________.

A.on timeB.on businessC.on duty

【答案】C

【解析】

句意：當李老師走進來看到干凈又整潔的教室時，他很滿意，并且表揚了值日的學生。

考查介詞短語辨析。on time準時；on business出差；on duty值日。根據(jù)前文“the clean and tidy classroom”可知，此處指表揚了值日的學生。故選C。

錯因①考生未能抓住句中的關鍵信息“the clean and tidy classroom”從而未能判定出此處所填介詞短語與打掃衛(wèi)生有關；②不了解三個選項所對應的具體語境；③未結(jié)合生活和學習常識判定。

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