We agreed ( ) here but so far she has not turned up yet.

We agreed ( to have met) here but so far she has not turned up yet.我们本来约定在这见面的,但是到目前为止她都还没出现.
没有 agree doing 这种搭配 只有agree to do 和 agree with 所以排除A和B.
agree with,agree to,意思是一样的,可是用法不同,他们都是同意某件事或某个人的意见的意思.
1 agree with,的用法是这样的：agree with+doing something或者+somebody
例句：I ageree with going to swim tomorrow.(我同意明天去游泳.)
I agree with you.(我同意你的意见)
2 agree to的用法是这样的：agree to +do something 决不可以agree to somebody.因为agree to 中to后面加动词不定式.指明是动词.
例句:I agree to go to swim tomorrow..(我同意明天去游泳.)