Going on a trip into space must be quite exciting experience.A. / ; theB. the; aC. the;

问题补充：

Going on a trip into space must be quite exciting experience.

A. / ; the

B. the; a

C. the; an

D. / ; an

答案：

A. / ; the

B. the; a

C. the; an

(答案→)D. / ; an

解析：可联系答.案.网客服索取。