We ________ saw him walking along the river bank.
A: occasion
B: occasionally
C: occasional
                    A: occasion
B: occasionally
C: occasional
举一反三
- We had been walking along the beach for nearly three hours _____ we saw a boat on the sea.
 - While walking along the icy river banks, we could see cracks in the ice _____ in all directions.
 - While walking along the icy river banks, we could see cracks in the ice _____ in all directions. A: adiating B: dividing C: splitting D: tearing
 - While walking along the icy river banks, we could see cracks in the ice ______ in all directions. A: radiating B: dividing C: splitting D: tearing
 - Steven used to visit him for the[input=type:blank,size:4][/input]days and weekends. (occasional, occasionally)
 
