it takes a lot of time travelling to Beijing 不是应该take (sb.)some time to do sth

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it takes a lot of time travelling to Beijing 不是应该take (sb.)some time to do sth
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it takes a lot of time travelling to Beijing 不是应该take (sb.)some time to do sth
it takes a lot of time travelling to Beijing 不是应该take (sb.)some time to do sth

it takes a lot of time travelling to Beijing 不是应该take (sb.)some time to do sth
两者都可以的,但是加不定式的情况比较常用.
it在这两句里都作为形式主语,代替后面的真正的主语——doing、to do s.th,因为真正的主语放在句首显得太长(travelling to Beijing takes a lot of time ),显得头重脚轻,故使用it代替.
因为现在分词和不定式都可以作主语,所以两者都可使用.

这是两种不同的表达方式。take (sb.)some time to do sth 中,不定式是真正的主语;而在it takes a lot of time travelling to Beijing 中用了现在分词短语的travelling to Beijing作了谓语动词takes的伴随状语。