问题标题：
【It'llbecheap___everywherebyplane.AtravelBtotravelCtravelingDtravels英语选择并说明理由】
问题描述：
It'llbecheap___everywherebyplane.AtravelBtotravelCtravelingDtravels英语选择并说明理由
韩览山回答：
to travel
It'll be cheap to travel everywhere by plane.
坐飞机到处去旅游很便宜.
it 是形式主语,真正主语是to travel everywhere by plane.
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