the last 20 years可以单独作状语吗（前面没有介词）

下面句子是2016年四川高考英语阅读理解B中的句子：

Our own experience working together on health, development, and energy the last twenty years has been one of the most rewarding parts of our lives.

问题：the last twenty years前面为什么没有介词？它可以单独作状语吗？

该问题已在这里一并解答了：

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

擅长：语法理论,语言学,文化背景 | 采纳率 86% | 回答于 1秒前

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陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

My answers to your question are as follows:

the last twenty years =in the past twenty years =在过去的20年里

在过去20年里，以下几种表达都正确，

(1)the last twenty years(right)

(2)in the last twenty years（right)

(3)over the last twenty years(right)

(4)within the last twenty years(right)

(5)in the past twenty years (right)

In the last five years he's undergone a personal transformation.

过去5年里他整个人发生了全新的转变。

Sales have quadrupled in the last five years.

过去五年中，销售额已增长至以前的四倍。

The company has grown rapidly in the last five years.

这家公司近五年来迅速地发展壮大.

Spending on military equipment has multiplied in the last five years.

过去的五年中军事装备的开支大大增加.

Trade between us has almost doubled in the last five years.

在过去五年中,我们之间的贸易额几乎增加了一倍.

Trade between us has almost doubled in the last five years.

在过去五年中,我们之间的贸易额几乎增加了一倍.

Charges on income have increased dramatically over the last five years.

所得税在过去的五年内显著增加.

Some 35.55 million urban dwellers found employment over the last five years.

五年来城镇新增就业3555万人.

Have you traveled to any countries within the last five years?

最近五年里您是否去过其他国家?