david is a student at new york university for a degree in computer scienceA studied B studying C to have studied D to be studing

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david is a student at new york university for a degree in computer scienceA studied B studying C to have studied D to be studing

david is a student at new york university for a degree in computer scienceA studied B studying C to have studied D to be studing
david is a student at new york university for a degree in computer science
A studied B studying C to have studied D to be studing

david is a student at new york university for a degree in computer scienceA studied B studying C to have studied D to be studing
B
david is a student studying at new york university for a degree in computer science
动名词表示主动,注意前面有is,所以只能用非谓语了.