his father has been to America twice 对twice 提问

his father has been to America twice 对twice 提问

题目
his father has been to America twice 对twice 提问
是真的,如果是上面那样,
答案
回答:How many times has his father been to America?
twice 是两次的意思 对次数提问要用How many times
应该不会吧,至少也有been吧!
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