后面那句话为什么不对?

题目

后面那句话为什么不对?
Because billions of tons of coal are yet to be mined,some argue that coal conservation measures are unnecessary.
With billions of tons yet to be mined,some argue that coal conservation measures are unnecessary.

答案

With billions of tons yet to be mined,some argue that coal conservation measures are unnecessary.
由with引导的独立主格结构里边没有主语,这样就对了:
With billions of tons OF COAL yet to be mined,some argue that coal conservation measures are unnecessary.