2. 外语
  3. The root system of most flowering perennials either become too crowded, which results in loss in vigor, and spread too far outwa

The root system of most flowering perennials either become too crowded, which results in loss in vigor, and spread too far outwa

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问题 The root system of most flowering perennials either become too crowded, which results in loss in vigor, and spread too far outward, producing a bare center.
选项 A、which results in loss in vigor, and spread
B、resulting in loss in vigor, or spreading
C、with the result of loss of vigor, or spreading
D、resulting in loss of vigor, or spread
E、with a resulting loss of vigor, and spread
答案D
解析 本句简化结构为：sth．either+谓语部分，现在分词短语表伴随结果，or+谓语部分，现在分词短语表伴随结果，仅D符合此条件。
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