Many countries have a lot of rockets into space. A. sentB. spentC. flownD. made

问题补充：

Many countries have a lot of rockets into space.

A. sent

B. spent

C. flown

D. made

答案：

(答案→)A. sent

B. spent

C. flown

D. made

解析：句意：很多国家已经把许多火箭送入了太空。send意为“送”, spend 意为“花费”，flow意为“流动”，make意为“制造”。