Final answer:
The correct answer to the sentence completion is option.c 'periods,' referring to lengths of time spent studying. This choice aligns with the context provided, where the student efficiently sequences their studies by taking general classes before focusing on their major.
Step-by-step explanation:
The sentence "I studied for long _______ during my last year at college." is looking for a noun that describes a division or a length of time. The correct answer is C. periods. This is because the word 'periods' in this context refers to divisions of time characterized by a specific activity - in this case, studying. The noun 'seasons' refers more to parts of the year marked by weather patterns; 'spaces' more commonly refers to physical areas or intervals; and 'exercises' refers to tasks or activities, especially for training or practice, not divisions of time.
By starting general studies classes in the spring, the student took advantage of being able to focus on major-specific courses in the fall. Taking classes in sequence this way is an efficient approach that can help students deepen their understanding in their chosen field of study, syncing well with periods of intense studying during the pivotal last year of college.