how life began on earth is one of t
问题描述：
how life began on earth is one of t
how life began on earth is one of the biggest puzzles that scientists found hard ____
选项有to slove ,to be sloved ,to sloving,sloving为什么选to slove,求详细解答分析句子成分,
答
选A
how life began on earth 是how引导的主语从句
is谓语
one of the biggest puzzles 宾语
that scientists found hard to solve 是that引导的定语从句,修饰宾语.其中：
that在定语从句中做的是宾语,这就是sb.find sth.+ adj.+ to do sth,的一个句型.thank u