Making friends is not easy. Sometimes it can take years you bee true friends with someone.
A. before
B. after
C. because
D. Unless
网友回答
(答案→)A. before
B. after
C. because
D. Unless
解析：考查连词的用法。依据第一句“making friends is not easy. 交朋友不容易。”及空格前后句意可推断出“在成为真正的朋友之前会花费好几年。”，故选A。