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It was ordered that no smoking________in the library.

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It was ordered that no smoking________in the library.
A.be allowed B.is allowed C.was allowed D.to be allowed
说明为什么选这个和为什么不选那个的详细原因
解释的越清楚越好!
It was ordered that no smoking________in the library.
强调句,
it was ordered that ...
还原
no smoking ordered ...in the library
order 是一个需要用虚拟语气的,所以用A
这里,省略了 should
原本是 should be allowed
答案A