Multiple choice

Directions: Fill up the blank with the correct option.

I have been working hard _____ arithmetic.

  1. on

  2. at

  3. by

  4. in

  5. over
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We use preposition 'in' for subjects and 'at' for practices. Here arithematic is treated as a practice (calculations), and thus 'at' is the correct option.

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