Friends are like leaves, everywhere, but true friends are like diamonds, precious and rare.
A. found
B. finding
C. to find
D. being found
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(答案→)A. found
B. finding
C. to find
D. being found
解析：考查非谓语动词：句意：朋友就像叶子，随处可见，但是真正的朋友就像钻石，珍贵稀缺。
在这里，叶子是可以到处被找到， 需要用被动形式，因此用found来修饰被比喻成叶子的朋友。选A。