While in Britain, he made friends with the natives there.
A. working
B. worked
C. he works
D. he is working
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(答案→)A. working
B. worked
C. he works
D. he is working
解析：考查状语从句的省略句：while引导的时间从句在与主句（he made friends with the natives there）主语一致的时候，其主语和be动词可以省略，原句是While he is working in Scotland, he made friends with the natives there.省略后，就是while working…，句意：在英国的时候，他和当地人交朋友。选A。