还是没人问过，GWD25-Q37

Though the law will require emissions testing of all diesel vehicles, from
        tractor trailers to excursion buses, it will have no effect on sport utility
        vehicles, almost all of which are gasoline powered, and will not be subjected to emissions-control standards as stringent as they are for
        diesel-powered vehicles.

A.       powered, and will not be subjected to emissions-control standards as stringent as they are for

B.        powered, and therefore not subjected to emissions-control standards
        that are as stringent as those of

C.       powered and therefore not subject to emissions-control standards as stringent as those for

D.       powered, which are not subject to emissions-control standards as
        stringent as they are for

E.        powered and therefore they are not subject to emissions-control
        standards as stringent as those of

最近越做越迷茫，脑筋不太清楚，如果大家觉得问题实在很白痴，请见谅...

答案选C，谢谢。。。

37. GWD25-Q37. C

Though the law will require emissions testing of all diesel vehicles, from
        tractor trailers to excursion buses, it will have no effect on sport utility
        vehicles, almost all of which are gasoline powered, and will not be subjected to emissions-control standards as stringent as they are for
        diesel-powered vehicles.

It=law，which=
        sport utility
        vehicles

A.  powered, and will not be subjected to emissions-control standards as stringent as they are for

will not be主语为it，it=law，law subjected错，应该是 SUV subjected to standards

B.  powered, and therefore not subjected to emissions-control standards
        that are as stringent as those of

and前面加“，”说明and不是which从句内部并列，而是和主句it will have no effect...并列/ that are不简洁

C.  powered and therefore not subject to emissions-control standards as stringent as those for

Cà  which are gasoline powered and not subject to ...standards as ... as those (standards) for

D.
                powered, which are not subject to emissions-control standards as
        stringent as they are for

两个which从句修饰SUV，两套修饰之间也没有连接词，有run-on的嫌疑

E.  powered and therefore they are not subject to emissions-control
        standards as stringent as those of

they指代不明白，which作主语放前面，后面的两个主语相同，应该省略一个

C

首先 those 是对的

其次standard for 是对的，standard of是错的

as strigent as those

请NN 分析下D E

D.       powered, which are not subject to emissions-control standards as
        stringent as they are for

E.        powered and therefore they are not subject to emissions-control
        standards as stringent as those of

D中which指代逻辑上为vehicles,但此处是指gasoline powered?

E 好像they有问题，可是不知道是什么原因，请NN 指正，谢了!!!

c选项中的and therefore not subject