Ich gratuliere dir ___ Geburtstag.
Answer and explanation
Correct answer: C. zum
- Step 1: 'gratulieren zu' + dative, contracted to 'zum', is the fixed phrase. Answer: zum. Why not the others: 'für', 'am' and 'beim' are not used with 'gratulieren'.
Practise more Grammatik: Präpositionen und feste Verbindungen.
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