不定式表示将来时.B表示过去.
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after graduation ,he went on to do some of the most important scientific research ever——--
after graduation ,he went on to do some of the most important scientific research ever——--
after graduation ,he went on to do some of the most important scientific research
ever——--
b.carried out
为什么 to be carried out 不对
after graduation ,he went on to do some of the most important scientific research
ever——--
b.carried out
为什么 to be carried out 不对
英语人气：429 ℃时间：2020-06-06 01:09:14
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