He is thoroughly proficient ___ computer applications and office management.
- At
- ON
- In
- With
Explanation
He is thoroughly proficient in computer applications and office management.
وہ کمپیوٹر ایپلی کیشنز اور دفتری انتظام و انصرام میں مکمل طور پر مہارت رکھتا ہے۔
- We use “in” because proficient in is a fixed preposition combination in English.
- Rule: Proficient + in + skill/subject
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