WHEN I CAME TO VISIT HIM LAST NIGHT, HE __________ HIS HOMEWORK. HE...

4)

When I came to visit him last night, he __________ his homework. He said that he __________ it since 6 o’clock

a)

did/did

b)

was doing/was doing

c)

was doing/has been doing

d)

was doing/had been doing