It is__________ his advice on how ___________English well_________ you a lot of trouble.    [ ]

A. because; to learn; that will avoid    

B. taking; to learn; that will save    

C. because of; learning; which will waste    

D. for;learning;that will make

差异性目标市场策略是企业以（）细分市场为目标市场，分别设计不同的产品，制定不同的营销组合，以满足细分市场的需求。

A.一个

B.两个

C.三个

D.多个