Believe it or not the Great Wall which by people should be protected at once.A. has be

问题补充：

Believe it or not, the Great Wall, which by people, should be protected at once.

A. has been destroyed

B. is destroyed

C. was destroyed

D. is being destroyed

答案：

A. has been destroyed

B. is destroyed

C. was destroyed

(答案→)D. is being destroyed

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