THEY _________ HIM FOR WEEKS .A. HAVE NOT SEEN B. DID NOT SEE C. D...

11. - KIEM TRA 1TIET SO 1 TRON 4 DE
KIEM TRA 1TIET SO 1 TRON 4 DE
11. They _________ him for weeks .A. have not seen B. did not see C. do not see D. will not have seen