二手双排小货车报价:How many cities have you travelled to ?中"to"可以省略吗?为什么?

How many cities have you travelled to ?中"to"可以省略吗?为什么? How many cities have you been to in China?的意思是什么？该怎样回答？ How many hair do i have ? How many sides does a circle have how many thorium bar have you 是什么意思？ how many legs does a spider have how many teeth does an adult have? How many sides does a house have? How many coats ____Peter? (have，has) He____two coats.(have，has) How many people have died of AIDS would wide?