Sometimes the student may be asked to write about his ________ to a certain book or article that has some bearing on the subject being studied.
句意： 有时， 学生可能被要求写自己对与研究课题相关的某本书或某篇文章的看法。 reaction“反应”， 这里引申为“想法， 看法”， 与介词to搭配， 符合题意。impression印象。 comprehension理解。 sentiment感情， 情绪。