单选题 This is the microscope ______ which we have had so much trouble.
   A) at              B) from        C) of          D) with
【正确答案】 D
【答案解析】这里是由介词+关系代词引导的定语从句,此处的介词和谓语动词是搭配使用的,即have trouble with sth. 故应当选D。