1. We were really late. When we go to the placer he conference ___
1)has already begun
2)already began
3)had already begun

2.I__my credit card. I can’t find it anywhere.
1)have lost
2)lost
3)had lost

3. My brother and Tom were best friends.They ___ each other for years.
1) have known
2) had known
3)knew

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