问题补充：
It was when I searched the Web for some information about my classmates that I your website.
A. came about
B. came after
C. came at
D. came across.
答案：
A. came about
B. came after
C. came at
(答案→)D. came across.
解析：考查动词词组辨析。句意为“我是在网上搜索同学信息时偶然遇到了你的网站。”come across“偶然遇到”，符合题意。come about“发生“；come after“紧跟 ”；come at“攻击;向...冲去”。
