If we keep on__so much paper,there will not be any trees left on the Earth.

问题描述:

If we keep on__so much paper,there will not be any trees left on the Earth.
A.waste B.to waste C.wasted D.wasting原因

选 D
keep on doing sth 保持做某事,一直做某事
如果我们一直浪费这么多纸,那么地球上就不会有树了.