I don't know how much it ___ to fly to London 单词拼写

问题描述:

I don't know how much it ___ to fly to London 单词拼写

I don't know how much it costs to fly to London

is

costs
理由 It costs sometime to do stn.
It takes sb sometime to do sth.
而原句I不作宾语,所以不存在三楼的句式,所以是costs