for前面的一个单词要用原形吗?比如study 在"he study for..."里面

单词的适当形式填空（ ）on,he went abroad for further study.(late)为什么 study for exam还是study for exams? study for a test this time for study study for a big study for the exam just for study~ my plan for english study的例文 英语的判断对错He needed to study for a test.He went online to order He felt bad for ______ a chance to study abroad. __ reflection,he decided to go abroad for further study. he should study for his English exam ,and you _______too