scientists warn that if —— so wastefully,natural resources on the earth will run out soon.
A being consumedb consuming
C consumedDhaving been consumed
答案选C
为什么啊
人气：227 ℃ 时间：2020-07-18 18:25:57
解答
省略了 （natural resources are） consumed那什么情况下可以省略呢？谢谢跟后面的主语一致的时候
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