Never before, in three centuries of royal rule,
___________ a foreigner access to its forbidden
city.
A. had the kingdom permitted
B. the kingdom had permitted
C. the kingdom permitted
D. permitted the kingdom
请写出详细的解题过程和思路

选A
倒装句（5）not

为了强调句子中的否定状语，常将其置于句首，通常采用部分倒装。
这类常见的具有否定意义的副词、连词和短语有：

副词：few, little, never, not, nowhere, rarely, seldom

连词：no sooner...than, hardly/scarcely/barely...when, not until,

not only...but also

短语：at no time, by no means, on no account, in no circumstances

Not until all the fish died in the river, did the villagers realize how serious the pollution was.

直到河里的鱼死了，村民们才意识到污染有多么的严重。

Not a single song did she sing at yesterday’s party.

在昨天的晚会上她一首歌都没唱。

No sooner had he arrived than he fell ill.

他刚刚来到这儿就马上生病了。

No sooner had she seen me than she turned crimson.

她一看到我，脸就变红了。

Hardly had she left home when it began to rain.

她一走出家门就开始下雨了。

Scarcely had they got back before the phone went.

他们一回到家，电话铃声就响了。

Little did I dream that such a thing would happen.

我连作梦都没想到会有这种事情发生。

In no circumstances will I allow you to go there.

不管发生什么事，我都不准你去那里。

In no other part of the world is more tea consumed than in Britain.

世界上再没有一个国家像英国那样爱喝茶的了。

Not until we lose our health do we realize its value.

等到失去了健康，才明白它的价值。

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注意：

一. 如果否定词只是否定主语时，不要倒装。

Not a soul was to be seen.

一个人影都看不见。

二. 如果not only...but also连接两个句子时，第一个句子要倒装，第二个句子不要倒装。

Not only did he hear it, but he saw it as well.

他不仅听见，而且看见了。