句意：默多克指出，从周二到周五，美国媒体都一直关注习（近平）即将到来的国事访问，以及习（近平）与社会各阶层的交流和互动。

你的怀疑是有道理的，个人认为这道题的命题不是很严谨，选项D（as much as）同样可以表示“既……又；不仅……而且”的意义。如：

It is for his humanity as much as his music that his numerous friends and pupils will remember him. 他的仁爱精神，以及他的音乐，都将长留在无数友人和学生的记忆里。《柯林斯高阶英汉双解学习词典》

▲关于这一点还可以参考英语语法网陈根花老师“as much as用法详解”一文（第二条，第4点）：

http://www.yygrammar.com/Article/201303/3171.html

4. 译为“既……又”“不仅……而且”。如：

It is as much our responsibility as yours. 这既是你们的责任，也是我们的责任。

It is as much your responsibility as mine. 这件事你和我一样都有责任。

He retorted that it was my fault as much as his. 他反驳说那不仅是他的错，而且也是我的错。或：他反驳说我的错误并不比他的错误小。

I expect to weep as much as (to) laugh. 我简直又想哭，又想笑。