–– must I take the medicine, doctor? –– Every six hours.A. How B. How longC. How often D. When 题目和参考答案——青夏教育精英家教网—

题目内容

––________must I take the medicine, doctor? –– Every six hours.

A. How B. How long

C. How often D. When

【解析】

试题分析：how的意思是“如何”；how long的意思是“多久”；how often“多久一次”；when的意思是“当……时候”；根据答语“Every six hours.”的汉语意思是“每六个小时。” 可知，此处用提问频率的特殊疑问词how often“多久一次”。

考点：考查特殊疑问词的用法

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