Has /have gone to
Someone has gone to a place but has not yet returned.
指某人去了某地，但是还没有回来
He&`&s gone to the bank. He should be back soon.
他去银行了。应该快回来了。
She&`&s gone to Moscow, she will be back next week.
她去莫斯科了。下周会回来。
Where has Eric gone? He was here a minute ago!
Eric去哪了？一分钟前他还在这呢。

Has / Have Been to
someone has visited a place at some time in their life.
指某人去过某地，已经回来，强调这种经历。
He&`&s been to London many times.
他去过伦敦很多次了。
I&`&ve been to France twice.
我去过法国两次。
Ask Tom for some money. He&`&s been to the bank today.
问Tom给你借些钱吧。他今天去过银行了。

今日挑战
用gone和been填空
把你的解析写在留言处和大家分享
I don&`&t know that restaurant, I&`&ve never ___ there.
Peter’s ___ to Canada and he&`&s staying there for three weeks.
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[答案] B正确；句子逻辑是，敲门敲了5分钟，才开门；换句话说，就是开门前敲了5分钟，所以用before，before之后引导的从句叫做时间状语从句。