17．We publish our school magazines twice a month．（對劃線部分提問）
How often do you publish your school magazines？

分析 我們一個月出版兩次學校雜志．
你們多久出版一次學校雜志？

解答 答案：How often．劃線部分是twice a month是表示一個月兩次，表示頻率，提問用疑問詞how often，故答案是How often．

點評 對劃線部分提問要分析劃線部分在句子中的成分，即可找出恰當?shù)奶厥庖蓡栐~．

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