Mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the following questions. 

Customers who subscribe to Travelog's online magazine will receive discounts -------their subscriptions are for six months or a year.

Suy nghĩ và trả lời câu hỏi trước khi xem đáp án

ATNETWORK
ADMICRO
YOMEDIA
ZUNIA9