问题补充：
In New York I found my friend Collins, who there some time before me.
A. would arrive
B. has arrived
C. had arrived
D. was arriving
答案：
A. would arrive
B. has arrived
(答案→)C. had arrived
D. was arriving
解析：此题重点考查过去完成时的基本用法，表示在过去的某一时间以前发生的动作或存在的某种状态，也就是过去的过去。其基本构成就是had+过去分词，其中had没有人称和数的变化。
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