You left London as fast as you could...为什么用could

You left London as fast as you could...后面 You could..为什么用could,差实义动词？

在比较结构中，经常承前省略，避免重复。

You left London as fast as you could.等于：

You left London as fast as you could leave London.

又如：

I am as happy as you. 等于：

I am as happy as you are. 等于：

I am as happy as you are happy.

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

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