I have been working hard ______ arithmetic?
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Answer: C. on
Explanation
The preposition on is required when describing dedicated study focused on an academic subject. Working on arithmetic means spending continuous effort learning mathematical principles and solving problems. This specific idiomatic collocation signifies active engagement with a particular discipline or task. Academic focus often utilizes the preposition on to indicate the chosen field of study. Verbs denoting labor or effort combine with specific prepositions to show the target. Arithmetic is the foundational branch of mathematics dealing with numerical operations.
Students often declare they are working on difficult homework assignments after regular classes. Researchers spend months working on complex scientific projects to achieve significant breakthroughs. Proper preposition usage in academic contexts prevents misunderstandings regarding professional responsibilities. Option in usually denotes physical enclosure or inclusion within a bounded area. Option at indicates a specific location or target rather than ongoing academic dedication. Option none of these is incorrect because the preposition on is grammatically appropriate.
- Subject
- English
- Category
- English Grammar and Vocabulary
- Topic
- —
- Difficulty
- medium
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