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

正确答案是C，我选B

请求指导一下B错在哪里

两个黄字部分有什么差别呢?

动词不是尽量补出比较清楚吗?

谢谢

请求指导一下B错在哪里

两个黄字部分有什么差别呢?

动词不是尽量补出比较清楚吗?

谢谢

B）错的原因是不是在於 and 只连结两件事，前面不需要打，

请您指教～谢谢