[求助]GWD-11-28

In
an effort to reduce the number of fires started by cigarettes, a major tobacco
company is test-marketing a cigarette in which thin layers of extra paper
are used to decrease the amount of oxygen entering the cigarette, thereby
slowing the rate at which it burns and lowering the heat it generates.

A.    in
which thin layers of extra paper are used to decrease the amount of oxygen
entering the cigarette, thereby slowing

B.     in
which they use thin layers of extra paper in decreasing the amount of oxygen
entering the cigarette, which slows

C.    that
uses thin layers of extra paper to decrease the amount of oxygen when it enters
the cigarette, thereby slowing

D.    for
which thin layers of extra paper are used to decrease the amount of oxygen that
enters the cigarette, and thereby slowing

E.     using
thin layers of extra paper in decreasing the amount of oxygen entering the
cigarette, which slows

麻烦各位大侠给分辨下，手里的答案是a，可是总觉得entering的修饰很不合理，但是其他的选项我也觉得有问题……这里看看谁能帮我解惑下啊

小人分析如下

a. entering的不合理

b.they无明确的修饰对象

c.句中的it与后面的it修饰对象不一致

d.and slowing的结构错误

e. in decreasing错误，应该是用to表目的。

谢谢各位了。

这个entering也不是强调动作，我觉得现在分词和定语从句做限制性修饰（就是没有逗号）的时候，没什么太大区别，虽然有总结说现在分词表经常性，定语从句表一次性，但是反例貌似也有

总之这里现在分词就是起了一个修饰作用，没觉得有在强调什么

这题我是在AC间排除的，因为另三个后半部分不对，C有个问题就是uses主动形式，我觉得不合适