Some scientists think it will take of years to make robots do most work for humans.

问题描述:

Some scientists think it will take of years to make robots do most work for humans.
A.hundreds B.hundred C.thousand
该选哪个 (写下原因)

a
hundreds of 数以百年的 固定短语
thousands of 成千上万的答案是C啊c不对a对