0G12-89 倍数比较

89. Dirt roads may evoke the bucolic simplicity of another
century, but financially strained townships point out
that dirt roads cost twice as much as maintaining
paved roads.
(A) dirt roads cost twice as much as maintaining
paved roads
(B) dirt roads cost twice as much to maintain as
paved roads do
(C) maintaining dirt roads costs twice as much as
paved roads do
(D) maintaining dirt roads costs twice as much as it
does for paved roads
(E) to maintain dirt roads costs twice as much as
for paved roads
Logical predication; Parallelism
Th is sentence intends to compare the costs
necessary to maintain two kinds of roads, but it
compares dirt roads generally with maintaining
paved roads. For the correct focus, the comparison
must be formulated x costs twice as much to
maintain as y rather than x costs twice as much as
maintaining y. X (dirt roads) and y (paved roads)
must appear in grammatically parallel
constructions.

C选项不太明白，’Maintaining dirt roads‘ 和 ‘paved roads do’ 感觉是对应了，要是没有do肯定错了，但是有do 为什么也错，参考答案是说和paved
roads对比，但是没考虑‘do’

paved roads do是和maintaining dirt roads costs 对应的,所以是paved roads对应maintaining dirt roads,而do和costs对应,所以不对称