Believe it or not,Jack has been to Beijing.

问题描述:

Believe it or not,Jack has been to Beijing.
为什么要用has been to,不用was to

一般现在时表示动作从过去发生一直沿继到现在,表达的意思就是Jack已经去了北京,并且现在还在北京;
而如果换成过去时意思就只能是:Jack过去去过北京,至于现在在哪,不知道.