you get on well with a number of people, you are usually friends with only a few .A. Sin

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A. Since
B. Where
C. Before
(答案→)D. While
解析：句意为：尽管你和很多人都相处融洽，但你通常只和几个人是朋友。while conj 虽然，尽管；since conj 既然；where conj在---地方；before conj在---之前。此处为让步状语从句的用法。