这是to do 不定时作主语的句子
真正的句型是：To understand why there is gravity is hard.由于主语太长,有些头重脚轻.
所以,说英语的人们常这样说：
It's hard to understand why there is gravity.
不是强调句
It's hard to understand why there is gravity这是强调句么
3个回答
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