Professor Jordon is well known for his _____ into the habits of the common housefly.
A. examination B. introduction
C. research D. expression
Professor Jordon is well known for his _____ into the habits of the common housefly.
A. examination B. introduction
C. research D. expression
C
research into对...研究：1)(作动词用)He is researching into the reading problems of young school children.2)（作名词用）to carry out a research(=some research)into the causes of brain damage.(对大脑损伤原因进行研究)。
研究可译为make researches into, make a study of 或直接用动词study vt或research into (a problem etc.).