This is the main use that the scientists make (___) of natural resources.A.it B.which C.use D./
问题描述：
This is the main use that the scientists make (___) of natural resources.A.it B.which C.use D./
答
答案是：D
that the scientists make of 是定语从句,修饰use.make use of 为固定短语,意思是“利用”