Question

When she was transferred to Miami, she had to buy a new car,

find a nice apartment, and
opening a checking account.

Answer 1

It should be “*open* a checking account” because ‘opening’ is in the wrong tense and does not agree with the other verbs ‘buy’ and ‘find’. She ‘transferred’ and ‘had to’ show that the sentence is talking about something that happened in the past.