in agreement 表示持相同意见。

要表示与某人意见一致，后面与介词with连用。

要表示在。。。方面意见一致， 后面与介词on或upon 连用。

You are in agreement with people when you agree with them.

My teacher nodded in agreement. 我的老师同意地点了点头。

He is in agrement with you on that point .

agree的用法

经典考题：

1. Though they are twins ,they are not always            each other .

   A. agree with  B. in agreement   C. in agreement with

Keys:

1. C