In May 2011, Americans spent 53 billion minutes on Facebook, it the most popular U.S. website.
A. making
B. made
C. to make
D. having made
网友回答
(答案→)A. making
B. made
C. to make
D. having made
解析：现在分词做结果状语。现在分词做结果状语表示正常的结果。意料之中的结果句意：在2011年3月，美国人530亿分钟在Facebook，让Facebook成为最受欢迎的网站。