OG SC103 jumbo rocket

perain

103. The development of a new jumbo rocket that is expected to carry the United
States into its next phase of space exploration will be able to deliver a heavier
load of instruments into orbit than the space shuttle and at a lower cost.
(A) The development of a new jumbo rocket that is expected to carry the United
States into its next phase of space exploration will be able to deliver a
heavier load of instruments into orbit than the space shuttle and at a lower
cost.
(B) The development of a new jumbo rocket is expected to carry the United
States into its next phase of space exploration and be able to deliver a
heavier load of instruments into orbit at a lower cost than the space shuttle.
(C) The new development of a jumbo rocket, which is expected to carry the
United States into its next phase of space exploration, will be able to deliver
a heavier load of instruments into orbit at a lower cost than the space
shuttle.
(D) A newly developed jumbo rocket, which is expected to carry the United
States into its next phase of space exploration, will be able to deliver a
heavier load of instruments into orbit than the space shuttle can, and at a
lower cost.
(E) A newly developed jumbo rocket, which is expected to carry the United
States into its next phase of space exploration, will be able to deliver a
heavier load of instruments into orbit than the space shuttle and to cost less.



答案是D, 书上的解释说E "Verb can is needed after space shuttle to create a correct comparison; to
cost less is confusing because it seems to parallel to deliver"
如果不考虑前面有没有can 的问题，will be able to deliver 。。。and to cost less这个结构是正确的么？求正解~！

2simple

网上搜到这个解释非常好：
http://gmatclub.com/forum/the-development-of-a-new-jumbo-rocket-that-is-expected-to-85062.html