.China is one of the countries in the world whichastronauts to space so far.A. have sentB.

问题补充：

.

China is one of the countries in the world whichastronauts to space so far.

A. have sent

B. has sent

C. sent

D. sending

答案：

(答案→)A. have sent

B. has sent

C. sent

D. sending

解析：可联系答.案.网客服索取。