The Leaning Tower of Pisa is the place of interest ---- almost all tourists will pay a visit when they arrive in Italy.A,to which B,in which 为什么选A?

The Leaning Tower of Pisa is the place of interest ---- almost all tourists will pay a visit when they arrive in Italy.A,to which B,in which 为什么选A?
The Leaning Tower of Pisa is the place of interest ---- almost all tourists will pay a visit when they arrive in Italy.
A,to which B,in which
为什么选A?

The Leaning Tower of Pisa is the place of interest ---- almost all tourists will pay a visit when they arrive in Italy.A,to which B,in which 为什么选A?
pay a visit to some place
which 引导了定语从句

almost all tourists will pay a visit to the place of interest .
to来源于固定搭配pay a visit to， the place of interest 为先行词。

The Leaning Tower of Pisa is so great 【an】ancient building 结构是【so +adj +a/an+n】这边ancient是原音，所以用an 有不会的可以再问我