问题
选择题
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
答案：D
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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：D
