我现在觉得B也有问题;参看OG78: 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 C is flawed by the nonparallel verb spreading and the wordy phrase that begins with the result of. |