Final answer:
The correct verp form that completes the sentence is 'supe'.
Step-by-step explanation:
The correct verp form that completes the sentence 'Yo que puedo comprar muchas cosas por un dólar en Ec' is
A. supe
This form is the first person singular preterite (past tense) form of the verb 'saber', which means 'to know'.
In this context, 'supe' means 'I knew' and correctly completes the sentence.
Learn more about Spanish Verbs