Some scientists think that it will take __ of years to make robots do most work for humans.
A. hundreds               B. hundred                C. thousand
A
考查數(shù)詞的用法。固定短語(yǔ)hundreds of“成百上千”、thousands of“成千上萬(wàn)”；如果前面沒(méi)有具體的數(shù)字，常用復(fù)數(shù)加of結(jié)構(gòu)表示不確切的數(shù)字。
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