问题
选择题
Having mastered the technologies of manned spacecraft, China became the third country in the world ______ manned spaceflight independently.
A．develop
B．to develop
C．developing
D．developed
答案
答案：B
这题考察不定式做定语的用法,当名词被序数词修饰时,应当用不定式做定语,就像这道题: the third country in the world后面接不定式做定语.句意是:掌握了载人飞船的技术后,中国成为世界上第三个独立进行载人飞行的国家.选B.