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This is a process          happens when land becomes desert        people cut down trees and dig up grass.
A.when; becauseB.that; because ofC.when; because ofD.which; because
D
本题修饰名词process是一个定语从句,关系词用that或which,本题后半句跟的是一个原因状语从句,用because来连接,故本题只能选D。
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