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voodoo_child
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The rapid-rail lines that were recently introduced in Sourthern California have had positive effects : not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.
a) not only have they lowered pollution levels, they have helped in decongesting
b) the lines have not only lowered pollution levels, but also helped in decongest
c) not only have pollution levels been lowered, but they have helped to decongest
d) lines have lowered pollution levels, as well as helped in decongesting
e) not only have they lowered pollution levels, but also have they helped decongest
Please explain your answer...
a) not only have they lowered pollution levels, they have helped in decongesting
b) the lines have not only lowered pollution levels, but also helped in decongest
c) not only have pollution levels been lowered, but they have helped to decongest
d) lines have lowered pollution levels, as well as helped in decongesting
e) not only have they lowered pollution levels, but also have they helped decongest
Please explain your answer...

















