Question

Some scientists think that it will take __ of years to make robots do most work for humans.
A. hundreds               B. hundred                C. thousand

Answer 1

A

考查數詞的用法。固定短語hundreds of“成百上千”、thousands of“成千上萬”；如果前面沒有具體的數字，常用復數加of結構表示不確切的數字。