She wants to know whether the measures have been agreed .
A. to
B. with
C. about
D. upon
E. over
答案是D.upon .
但我非常奇怪和不解：A. to, B. with, C. about - 这3个选择不也可以吗？
译文：她想了解这类手段是不是已经达成一致。
agree on / upon 用来指获得或达到赞同的事物（表“达成一致”）。比如：
Iagreewithyouonthat point. 在那一点上我赞同你。
The representatives of the two sides have nowagreed onthe proposals to be put before their members. 双方的代表现已赞同那几项提交给他们的成员的建议。
▲至于agree与to, with, about等介词搭配所表达的意义，可参看以下链接：
http://ask.yygrammar.com/q-4739.html