题目

 Our foreign teacher sometimes can’t understand what I was saying, _______he tells me to speak loudly and clearly.     A. because   B. however   C. but   D. so 答案：D21、非公有制经济与国有经济和集体经济实现联合生产或经营的经济形式，我们称之为 A．混合所有制经济          B．国有经济             C．公有制经济           D．合作经济