a sc

hanth

128. New hardy varieties of rice show promise of producing high yields without the costly requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties.
A. requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties
B. requirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation
C. requirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties
D. application of commercial fertilizer and irrigation that was required by earlier high-yielding varieties
E. irrigation and application of commercial fertilizer that were required by earlier high-yielding varieties
how to undersatand the problem? why E not ohters?

lixiaoyang

costly的搭配问题：最好是昂贵的什么而不是昂贵的需求。
d 的was不对