Getting to other plants or to the moon __many problem A involve B involves

分类: 作业答案 • 2021-12-28 18:28:40

问题描述：

Getting to other plants or to the moon __many problem A involve B involves
为什么

答

B,因为助于Getting to other plants or to the moon,这个全部是名词,动词+ING是动名词,做主语,当做第三人称单数.所以用B.