英语science and technology 作主语

来源：百度知道编辑：UC知道时间：2024/05/29 18:03:04

China sent up ShenzhouVII manned spaceship into space successfully, which shows science and technology _____ rapidly in China.
A. have been developing B. develops C. is developing D. has developed
这道题目的答案是选a，我不明白为什么是选这个时态，而不选c，不是可以表示正在发展变化的过程吗？还有一个问题就是science and technology 做主语是应不应该看成是一个整体表示科技呢，谓语用单数还是复数
谢谢各位的帮忙

用完成时表示已经发生,对现在产生影响并可能延续到将来.而一般进行时只表示现在的动作状态.
The writer and singer likes fishing.那个作家兼歌手爱好钓鱼.(用单数,只有一个定冠词,为一个人)
The writer and the singer like fishing.(用复数,有两个定冠词,表示形容的是独立的两个人)
这里的science and technology均不加冠词,视为两项独立存在的事物

题目本身就要求分开说科学与技术，是分开所指而非笼统概念，所以要用复数。时态的话，用完成进行时说明以前的某个动作一直持续不断的在进行！

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