Prep-2-1

1. (24163-!-item-!-188;#058&001054)

Since the start of the space age, more and more littering has occurred in orbits near Earth, often because the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.

(A) more and more littering has occurred in orbits near Earth, often because

(B) orbits near Earth have become more and more littered, often from

(C) orbits near Earth became littered more and more, often resulting from

(D) there have been more and more littering of orbits near Earth, often because of

(E) there had been littering more and more of orbits near Earth, often with

B是正确的，但是有一个疑问。我认为often from所修饰的应该是litter，但是B这里好像是修饰orbits的。或者说这里也和现在分词一样，修饰的的是前面那个现象？

麻烦大家了。

同问。。。我觉得首先不可能修饰littered吧，因为都不是名词。

没人管我

呵呵，那也可以接着学习。

介词短语的副词用法中的几个用法:

1.修饰动词   He spoke in a great hurry.

2.修饰形容词  Mary is good at cooking.

3.修饰其他的副词   We live nearest to the church

4.修饰全句   He admitted, to my amazement, that he didn't know.

             In other words, we had to give up our plan.

这个问题里所说的often from修饰orbits应该是指，from介词短语修饰动词，其逻辑主语是orbits。但是在这里逻辑上不同，orbits不是from***的。而第四种用法倒是可以解释得通--修饰前面整句的内容，也就是该event是来自于****。

仅供参考...

umm...ing短语作状语时我没见过修饰全句的，貌似都只是修饰动词或者什么都不修饰的。我想在这点上ing短语和介词短语有区别吧