We can't hope to solve all the ecological problems,____arise directly or indirely from overuse ofthe earth's resources.A.many of them B.in which many C.many of which D.of which they选什么.求详解

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We can't hope to solve all the ecological problems,____arise directly or indirely from overuse ofthe earth's resources.A.many of them B.in which many C.many of which D.of which they选什么.求详解

We can't hope to solve all the ecological problems,____arise directly or indirely from overuse ofthe earth's resources.A.many of them B.in which many C.many of which D.of which they选什么.求详解
We can't hope to solve all the ecological problems,____arise directly or indirely from overuse of
the earth's resources.
A.many of them B.in which many C.many of which D.of which they
选什么.求详解

We can't hope to solve all the ecological problems,____arise directly or indirely from overuse ofthe earth's resources.A.many of them B.in which many C.many of which D.of which they选什么.求详解
C 非限制性定语从句