Choose the model

Question

Select the best choice that has similar meaning to the following sentence:

My husband didn’t leave the car key, so I couldn’t pick him up at the station.

Accepted Answer

If my husband had left the car key, I could have picked him up at the station.

Answer

Unless my husband had left the car key, I could have picked him up at the station.

Answer

If my husband had left the car key, I could pick him up at the station.

Answer

If my husband left the car key, I could have picked him up at the station.