new hardy varieties of rice show promise of producing high yields without the costly requirements of irragtion and application of commercial fertilizer by earlier high-yielding varieties. A requirements of irragtion and application of commercial fertilizer by earlier high-yielding varieties. B requirements by eariler higher-yeilding varieties of application of commercial fertilizer and irragation. C requirements for application of commercial fertilzer and irragation of earlier higher-yielding varieties. D application of commercial fertilizer and irragation that was required by earlier higher-yielding varieties. E irragation and application of commercial fertilizer that were required by earlier high-yielding varieties. 答案是E 我想问D为什么错? application of A and B that was ..... 中was 与 application 主谓一致 that 跳跃修饰有什么不妥呢?
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