✔ 最佳答案
時態有問題!
1. You should use Simple Past tense to describe the event.
I just left (一離開) ABC Department Store, where I found many different kinds of products. I bought a lot of them.
2. You can use Present Perfect to state recent past event with focus on the result.
I have just visited ABC Department Store and (have) bought many products.
(two clauses with present perfect connecting with conjunction "and")