Fill in the blank with the most appropriate word. She ________ a sweater last Tuesday.

The correct answer is B. bought.

The sentence is in the past tense, so we need to use a past tense verb. Of the four options, only “bought” is a past tense verb.

• “Buys” is in the present tense.
• “Is buying” is in the present continuous tense.
• “Will buy” is in the future tense.

Therefore, the only option that makes sense in the context of the sentence is “bought”.

She bought a sweater last Tuesday. This means that she purchased the sweater on Tuesday in the past.