Answer and explanation

Correct answer: D. einem

  1. Step 1: 'seit' takes the dative, and 'Jahr' is neuter, so 'einem'. Answer: einem. Why not the others: 'ein' is nominative, 'einen' masculine accusative and 'eines' genitive.

Practise more Grammatik: Fälle, Verben und Satzbau.

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