这些句子为什么都加to.1.it's up to you------( make) the decision
问题描述：
这些句子为什么都加to.1.it's up to you------( make) the decision
这些句子为什么都加to.
it's up to you to make ( make) the decision
it's a good way to learn (learn) english.
the city zoo is a good place to go (go )on weekends
答
因为这些都是考察it做形式主语,不定式to do做真正主语的用法.