题目内容
Mr. Smith is the only one of those foreigners who ________ in China.
A.work B.is working C.are working D.had working
B
先行词为the only one of those foreigners,表示单数含义,故定语从句的谓语动词用单数,排除A、C两项;题干中没有明确表示过去的时间状语,故排除D项。
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