At one time we had about eighty people here who did nothing but ___ into his family history.(D)

At one time we had about eighty people here who did nothing but ___ into his family history.(D)

题目
At one time we had about eighty people here who did nothing but ___ into his family history.(D)
A.to research B.researched C.researching D.research
答案
do ...but do
前面不是do而是其他动词的话就是 动词..but to 动词
以前我们大约有八十来个人不做其他事,只是调查他的家庭史
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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