参考答案：D

解析：固定搭配。spur on鞭策，激励，疾驰：He was spurred on by ambition．他胸怀大志。encourage鼓励，激励：encourage a man to work better鼓励一个人更好地工作。approve赞成，满意：The teacher looked at John's work and approved it．老师看了约翰的作业表示赞许。inspire鼓舞，激发，启示：inspire sb．with hope激起某人的希望。