明日の朝、六時に___つもりです。 (I plan to get up at six tomorrow morning.)

Answer and explanation

Correct answer: C. 起きる

つもり follows the dictionary form to express an intention.
Answer: 起きる.
Why not the others: 起きた: つもり is not used with the past form for a future plan. 起きて: つもり needs the dictionary form. 起きます: the polite form is not used before つもり.

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