问题描述：
My father goes to Xining [four times a year].(对括号部分提问) _ _ _ your father _ to xining?
My father goes to Xining [four times a year].(对括号部分提问)
_ _ _ your father _ to xining?
My father goes to Xining [four times a year].(对括号部分提问)
_ _ _ your father _ to xining?
问题解答：
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