the buses,most ___ _____were already full ,were surrounded by many passenfers whe were going to wor定语从句填空

the buses,most ___ _____were already full ,were surrounded by many passenfers whe were going to wor定语从句填空
the buses,most ___ _____were already full ,were surrounded by many passenfers whe were going to wor
定语从句填空

the buses,most ___ _____were already full ,were surrounded by many passenfers whe were going to wor定语从句填空
of which

the buses,most of which were already full ,were surrounded by many passenfers whe were going to wor