请说出选择的理由
问题描述：
请说出选择的理由
Itwas required that the tall building _______ at present because it is still new.
A.was not pulled down B.was not pull down
C.not being pulled down D.not be pulled down
答
答案选【D】
这里是虚拟语气的用法,it is/was required that sb (should) do sth.
should 可以省略,后面跟动词原形
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