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7.I read 21st Century twice a week.(对画线部分提问)
Howoften do you read 21st Century?

分析 --我每周读两次第二十一世纪.
--你多久读一次第二十一世纪?

解答 答案:How often.考查划线部分提问.根据twice a week每周两次.可知对频率提问用疑问词组how often多久.答案是How often.

点评 对划线部分提问,要根据划线部分内容选择合适的疑问词,剩下的变为一般疑问句.注意区分疑问词的用法.会正确运用一般疑问句用法.

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