题目

 —Have you persuaded him? —Yes. After some hours of discussion, I ______ to reason him in accepting the new plan.       A. had managed            B. would manage          C. have managed          D. managed 答案：D假若一种疾病使草原上的野羊全部死亡，首先受害的是（　　）A．生产者B．次级消费者C．分解者D．初级消费者