单项选择题
（）you choose to contact us, you can expect our efficient and helpful service.
A． No sooner than B． Ever since C． No matter how D．Even though
单项选择题 People invest money in this company（）they believe it will make profits.
单项选择题 As a public relations officer, you should know your customers（）detail.
单项选择题 In order to improve your communication skills, we will show you how to learn（）about your customers than you know now.
