In this context, should I use "have" or "had"? I am not really sure. Please help. Thank you.
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Both the constructions are correct. If you say
Were you able to go to their office and have an on-site interview?
You can parse it as
"Were you able to go to their office and able to have an on-site interview?
(Were you able to go to their office) and ( you had an on-site interview)?