.Saving resources is a basic policy of our country . And it proves to its sustainable dev

问题补充：

.Saving resources is a basic policy of our country . And it proves to its sustainable development .

A. to be great significance

B. to be of great significant

C. of great significance

D. great significant

答案：

A. to be great significance

B. to be of great significant

(答案→)C. of great significance

D. great significant

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