Since the launch in 2005 was successful,China has been the t

答案就应该是 D
这是动词不定式 作定语 与所修饰词 是主谓关系.
选项C 是现在分词作定语 在此不妥
语法规则 如果 两个动作 在时间上 不是同时发生,而是有先后之分,则不可用现在分词作定语.
可以用定语从句 表示.
如 the students seeing the film are coming out of the cinema.这是错误的表达.
应该是the students who have seen the film are coming out of the cinema..
本题 可以写成 ,China has been the third country( that has sent )its astronauts into.
也可以 用.动词不定式作定语 .这是 一个常用句型.
类似的 例子 he is always the first to come.