15．You need to have your eyes checked twice a year．（對劃線部分提問）
Howoftendo I need to have my eyes checked？

分析 你需要每年檢查眼睛兩次．
我多久檢查一次眼睛？

解答 答案：How often．根據(jù)劃線部分twice a week得知詢問的是頻率，故用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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