答案：C

选C　考查含插入语的特殊疑问句的强调句型。句意：“你认为是什么使得全世界关注中国？”“当然是快速、稳定的经济增长。”本题的解题思路是I think rapid and steady economic growth has brought worldwide attention to China。然后就rapid and steady economic growth提问变为特殊疑问句，即What do you think has brought worldwide attention to China？然后考虑What has brought worldwide attention to China？的强调句型是What is it that has brought worldwide attention to China？最后考虑本句中特殊疑问句的强调句作you think的宾语，故需用陈述句语序，即What do you think it is that has brought worldwide attention to China？故选C。