hasn't been to--------没有去过,没有参观过,没有到过
-------He is always talking about London,but he hasn't been to that city yet.
hasn't gone to --------还没有去,还在路上,或者还在你说话的地方
------He is still here with us.He hasn't gone to school yet.
------- He hasn't gone to school yet.He is still on his way there.