is that possible to fly to the moon in a spaceship?为什么用that

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/06/13 11:14:17

is that possible to fly to the moon in a spaceship?为什么用that 而不是now,man,it?

that 在这里是形式主语,可以换成it:is it possible to fly to the moon in aspaceship?
所以that在里实际是代表了”to fly to the moon in a spaceship"这几个词.而now man都是实词,不用于形式主语.
再问： it也可以？
再答：一般情况下是没有错的。除非有上下文。还有就是如果这是一道先择题那应该选最好的答案，就是that 因为这比较符合日常习惯。

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