15．You'd sound a lot more polite if you make a request _________ a question．（　�。�
A．in search ofB．in the form ofC．in need ofD．in memory of

分析 如果你以疑問的形式提出要求聽起來會更禮貌．

解答 答案是B．本題主要考查介詞短語辨析．in search of 搜尋；in the form of 以…形式；in need of 需要；in memory of為了紀念…；根據(jù)句句意和常識判斷，"以疑問的形式"會使請求聽起來更禮貌，所以答案選擇B．

點評 本題考查介詞短語的語義辨析，考生在平時的學習中應注意積累相應的短語和詞匯，并牢記其意思．在做題時，將短語的意思和題干相結(jié)合，從語法、句子結(jié)構(gòu)尤其是句意上去判斷，句意通順，符合邏輯，即正確答案．

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