It takes 10-12 days from the Earth to the Moon rocket.
A. to travel, by
B. traveling, on
C. travel, on
D. traveling, by
网友回答
(答案→)A. to travel, by
B. traveling, on
C. travel, on
D. traveling, by
解析：句意：从地球发射火箭到月球，需要10到12天的时间。it takes some time to do sth花费多长时间做某事，by rocket乘火箭，故选A