One hundred years______not a very long period of time in human history though only a few

学历类 专四 已帮助 人

One hundred years______not a very long period of time in human history, though only a few people can live that long.

A.is

B.are

C.has been

D.have been

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。