Choose the correct preposition: 'She is good ___ mathematics.'
Aat
Bin
Cfor
Don
Answer & Solution
Correct answer: A. at
'Good at' (a skill/subject).
**Compare:** 'good in' (a class/group), 'good for' (purpose), 'good on' (chance/luck — informal).
Keep practising Unit 7D: Determiners, Articles and Prepositional Usage
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