She wants to know whether the measures have been agreed upon.

参考译文：她想知道这些措施是否已经达成协议/已经达成一致意见。

agree upon/on 商定；议定；就…达成协议；同意;赞成;就..达成一致意见

Both have agreed on the need for the money...  

两个人一致表示需要那笔钱。

Can we agree on a date? 我们能否约定一个日期？

The warring sides have agreed on an unconditional ceasefire.

交战各方已经同意无条件休战。

A. to(不正确）原因如下：

(1)agree to 同意/赞成某事

Donna agreed to both requests.两个请求唐纳都同意了。

All 100 senators agree to a postponement.100位议员全都同意延期

(2)agree to do sth同意/应允/答应做某事

He agreed to pay me for the drawings.他答应向我支付这些画的钱。

B. with（不正确）原因如下：

agree with sth 主要有以下几种意思

(1)赞成/赞同某事

I don't agree with what they're doing.

我不赞同他们正在做的事情。

In his heart he knew they'd agree with his stand.

他内心明白他们会赞成他的立场。

(2)相符;吻合;与…一致

His second statement agrees with facts as stated by the other witnesses. 

他的第二份供述与其他目击证人所陈述的事实相符。

(3)（食物）不对胃口，使不舒服

I don't think the food here agrees with me. 

我觉得这里的食物不对我的胃口。

(4)（地方、经历）适合，适宜，对…有益

You look great, Brian. The Bahamas certainly agree with you. 

你看上去气色好极了，布赖恩。巴哈马显然很适合你。

C. about（不正确）原因如下：

agree about对某事[物]有同样看法，就某事取得一致意见 

They never agree about politics. 

他们在政治观点上从不一致。 

We agreed about how to try it. 

我们就怎样试行取得了一致意见。 

They could not agree about who should do the work. 

对于谁该做这项工作, 他们意见不一致。 

D. upon（为正确答案）

agree upon. 对某事〔物〕有同样看法, 商定〔同意〕某事, 商定做某事 

As soon as the details had been agreed upon, the results would be proclaimed. 

一旦细节问题取得一致意见, 结果将予以公布。 

E. over（错误）原因如下：

没有agree over搭配