--As for Mr Brown, do you know ?
--Sure. Canada. But he has been teaching French for two years in Shanghai.
A. where he is working B. where he es from C. where is his motherland
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解析：考查宾语从句的用法。宾语从句要使用陈述语序，先排除C；根据答语，他目前在上海工作，A项的显然合题意，也就是说，他来自Canada。故选B。