After the Shenzhou-9 manned spacecraft was successfully launched Liu Yang became the firs

问题补充：

After the Shenzhou-9 manned spacecraft was successfully launched, Liu Yang became the first woman astronaut space in China.

A. to enter

B. enter

C. entering

D. entered

答案：

(答案→)A. to enter

B. enter

C. entering

D. entered

解析：考查不定式做定语的用法：the +序数词+（名词）后面是 + to do 作定语，句意：神舟九号飞船成功发射后，刘洋成为中国第一位进入太空的女航天员。