It’s those experience ups and downs with us are real friends.
A. that, that
B. who, that
C. that, which
D. that, who
网友回答
A. that, that
(答案→)B. who, that
C. that, which
D. that, who
解析：考查定语从句和强调句型。第一空是定语从句，先行词是those，who指代先行词在句中做主语；第二空的that与it is构成强调句型。句意：只有那些经历过生活中的起起伏伏的人才是真正的朋友。故B正确。