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

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

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

A.has been destroyedB.is destroyedC.was destroyedD.is being destroyed

试题答案

D

解析