.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 |
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.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 |
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