much of the carbon in the earth comes from things that once lived地球上大部分碳来自于曾经有生命的东西.1：comes可以去掉吗?这里固定搭配?2：things that once lived可以改成ever living things吗?为什么?
问题描述：
much of the carbon in the earth comes from things that once lived地球上大部分碳来自于曾经有生命的东西.
1：comes可以去掉吗?这里固定搭配?
2：things that once lived可以改成ever living things吗?为什么?
答