HE SAID THAT HE _____ HIS HOMEWORK SINCE 7 O’CLOCK

17. - TONG HOP BAI TAP VE TU LUAN TONG HOP BAI TAP VE TU LUAN
TONG HOP BAI TAP VE TU LUAN TONG HOP BAI TAP VE TU LUAN

17. He said that he _____ his homework since 7 o’clock.

A. has done

B. did

C. had done

D. was doing