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题目
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

提问时间:2021-03-04

答案
D
do nothing but do sth.
如果是某个具体动作,do sth.but to do sth.
例如,I did not go but to stay here.I did nothing but stay here.
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