78. The root systems of most flowering perennials either become too crowded, which results in loss in vigor, and spread too far outward, producing a bare center. (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 Choice A misuses which: as a relative pronoun, which should refer to a specific noun rather than to the action of an entire clause. A also produces the unidiomatic and illogical construction either... and. Choice B properly uses a verb phrase (resulting ...) instead of which to modify the action of the first clause and also correctly completes either with or, but the verbs following either and or are not parallel: spreading must be spread to match become. Choice C is flawed by the nonparallel verb spreading and the wordy phrase that begins with the result of. Choice E is similarly wordy and uses and where or is required. Choice D--concise, idiomatic, and parallel with the rest of the sentence--is best.
答案是D没有问题,但是答案的解释 “Choice A misuses which: as a relative pronoun, which should refer to a specific noun rather than to the action of an entire clause.” Which是可以引导非限制定语从句修饰整个句子的呀 如果答案A为 which results in loss in vigor, or spread 算正确吗 当然用分词形式的 resulting in loss of vigor, or spread 会简洁会更好,我只是想知道为什么非限制性定语从句在这里不能使用。
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