PREP 1-133 请大家进来指点指点

(A) most of them as large or larger than Jupiter, which circle

(B) most of them as large or larger than Jupiter and circling

(C) most of them at least as large as Jupiter, circling

(D) mostly at least as large as Jupiter, which circle

(E) mostly as large or larger than Jupiter, circling

答案是C

问题（1) 

语法笔记上说(D) mostly是副词，修饰错误。mostly 修饰什么错误了？？？

问题（2）

C 选项中的 Circling 有 即修饰 80 massive planets 又修饰 Jupiter 之嫌疑，这不会产生歧义吗？

The students in our class are mostly northerners．我们的学生大部分是北方人．

 I write to my mother every week，mostly on Sundays．我每周都给母亲写信，大部分在星期日写．

谢谢楼上的指点，

但副词修饰副词也是可以的啊。比如very quickly.

所以说我认为 这里的mostly 修饰 at least 应该是可以的.

另外,

C 选项中的 Circling 有 即修饰 80 massive planets 又修饰 Jupiter 之嫌疑，这不会产生歧义吗？

请大家指点

版主，还是不太明白，能仔细说说吗？

是插入句优先级比较低，在做选择的时候可以被先排除？