At one time we had about eight people here who did nothing but__into family history 为什么填researc

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• At one time we had about eighty people here who did nothing but _____ into ho family history.A.to research B.researched C.researching D.research 请问是哪个答案,为什么呢我一直觉得应该是a,可答案给的是d..那什么时候有to 什么时候没有to呢
• At one time we had about eight people here who did nothing but__into family history 为什么填researc如果填researching行吗?
• 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
• At one time we had about eight people here who did nothing but__into family history 为什么填researc
• 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 ho family history.
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