单选题 Research recently conducted on the side effects of the medication ______ that it should not be prescribed to diabetic patients.
A. has found B. has been found
C. finds D. was finding

【正确答案】 A
【答案解析】[解析] 此题为选择动词的正确形态的问题。句子表示“最近的研究确定了……”，同时，主语research和动词find为主动关系，故选A。