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?

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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
• 1.It was not until December 31 __________ we heard from him.A.which B.when C.that D.then2.At one time we had about eighty people here who did nothing but __________into various family history.A.researched B.research C.researching D.to research3.— How __________ will you be able to come back from you travel?— In a couple of weeks,perhaps.A.fast B.long C.often 4.Your hair needs __________.You’d better have it done tomorrow.A.cut B.cutting C.to cut D.bei
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