Concept:Identify the word that is most nearly opposite in meaning to the underlined word and fits the gap correctly.
Explanation:The underlined word "keen" means eager, enthusiastic, or showing strong interest.
A keen student is willing to learn and work hard, so such a student makes progress.
The sentence contrasts this with another type of student who "hardly does well."
We need a word that means the opposite of "keen" and explains why this student performs poorly.
"Reluctant" means unwilling, hesitant, or disinclined.
A reluctant student lacks enthusiasm for learning, so he or she hardly does well.
"Inactive" means not active, but it does not carry the sense of unwillingness.
"Lowly" means low in rank or position, which is unrelated.
"Nervous" means anxious, which is not the direct opposite of "keen."
Therefore, "reluctant" is the best choice.
Answer:D. Reluctant