At one time we had about eighty people here who did nothing but______into various family history.

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问题 At one time we had about eighty people here who did nothing but______into various family history.

选项 A、researched
B、research
C、researching
D、to research

答案B

解析本题考查的是非谓语动词在固定结构“do nothing but”后的用法。do nothing but意思是“只做；专门做”，其后跟动词原形，即不带to的不定式。根据句子结构可以看出，定语从句中的did nothing but后应跟动词原形，所以选项B为正确答案。

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