My father flies to Shanghai twice a month.对twice a month提问,_ _ your father fly to Shanghai?

My father flies to Shanghai twice a month.对twice a month提问,_ _ your father fly to Shanghai?

题目

My father flies to Shanghai twice a month.对twice a month提问,_ _ your father fly to Shanghai?
我总觉得少了条横线.

答案

你是对的,这里应该填三个单词：How often does your father fly to Shanghai?

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