答案应该是B
1.根据题意,什么可以提升外空的开发.aircraft是飞机,而spacecraf是宇宙飞船,所以可以排除BD.
2.然后判断名词的单复数,various 是各种各样的,所以后面的名词应该是复数名词,promote之所以变形是因为,invention是主语并且为单数,所以promote为单三形式
The invention of various____promotes the exploration of oute
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